Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

• U1000 CAN comm circuit

Description Refer to LAN-24, "CAN Communication Signal Chart". DTC Logic DTC DETECTION LOGIC DTC Trouble diagnosis name DTC detecting condition Possible cause U1000 CAN COMM CIRCUIT Driver seat control unit cannot communicate to other control units. Driver seat control unit cannot communicate for more than the specified time. Harness or connectors (CAN communication line is open or shorted) DTC CONFIRMATION PROCEDURE 1. STEP 1 Turn ignition switch ON and wait at least 3 seconds. 2. STEP 2 Check "Self diagnostic result" with CONSULT. Is the DTC detected? Diagnosis Procedure Refer to LAN-15, "Trouble Diagnosis Flow Chart". Special Repair Requirement Refer to Owner's Manual.

• U1010 control unit (CAN)

Description Refer to LAN-24, "CAN Communication Signal Chart". DTC Logic DTC DETECTION LOGIC DTC No. Trouble diagnosis name DTC detecting condition Possible cause U1010 CONTROL UNIT (CAN When detecting error during the initial diagnosis of CAN controller of driver seat control unit. Driver seat control unit Diagnosis Procedure 1. REPLACE DRIVER SEAT CONTROL UNIT When DTC [U1010] is detected, replace driver seat control unit.

• B2130 eeprom

DTC Logic DTC DETECTION LOGIC DTC No. Trouble diagnosis name DTC detecting condition Possible cause B2130 EEPROM Driver seat control unit detected CPU malfunction Driver seat control unit DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Check "Self diagnostic result" with CONSULT. Is the DTC is detects? Diagnosis Procedure 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Check "Self diagnostic result" with CONSULT. Erase the DTC. Perform DTC confirmation procedure. Refer to ADP-38, "DTC Logic". Is the DTC displayed again? 2. REPLACE DRIVER SEAT CONTROL UNIT Replace driver seat control unit. Refer to ADP-169, "Removal and Installation".

• B2112 sliding motor

Description The seat sliding motor is installed to the seat frame. The seat sliding motor is activated with the driver seat control unit. Slides the seat forward/backward by changing the rotation direction of sliding motor. DTC Logic DTC DETECTION LOGIC DTC No. Trouble diagnosis name DTC detecting condition Possible cause B2112 SEAT SLIDE The driver seat control unit detects the output of sliding motor output terminal for 0.1 second or more even if the sliding switch is not input. Driver seat control unit Front power seat LH (sliding motor) harness is shorted DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Check "Self diagnostic result" with CONSULT.

• B2113 reclining motor

Description The seat reclining motor is installed to the seatback assembly. The seat reclining motor is activated with the driver seat control unit. Tilts the seatback forward/backward by changing the rotation direction of reclining motor. DTC Logic DTC DETECTION LOGIC DTC No. Trouble diagnosis name DTC detecting condition Possible cause B2113 SEAT RECLINING The driver seat control unit detects the output of reclining motor output terminal for 0.1 second or more even if the reclining switch is not input Driver seat control unit Front power seat LH (reclining motor) harness is shorted DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON.

• B2116 tilt motor

Description The tilt motor is installed to the steering column assembly. The tilt motor is activated with the automatic drive positioner control unit. The steering column is tilted up/down by changing the rotation direction tilt motor. DTC Logic DTC DETECTION LOGIC DTC No. Trouble diagnosis name DTC detecting condi Possible cause B2116 STEERING TILT The automatic drive positioner control unit detects tilt motor operation for 0.1 second or more when tilt switch has not been turned on, and there is no output of automatic operation. Automatic drive positioner control unit Tilt motor harness is shorted DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON.

• B2128 UART communication line

Description Driver seat control unit performs UART communication with the automatic drive positioner control unit using 1 communication line. Driver seat control unit receives the operation signals of ADP steering switch, door mirror remote control switch and the position signals of tilt sensor, telescopic sensor and door mirror sensors from the automatic drive positioner control unit and transmits the operation request signal. DTC Logic DTC DETECTION LOGIC DTC No.

• Power supply and ground circuit

BCM BCM : Diagnosis Procedure Regarding Wiring Diagram information, refer to BCS-67, "Wiring Diagram". 1. CHECK FUSE AND FUSIBLE LINK Check if the following BCM fuses or fusible link are blown. Is the fuse or fusible link blown? 2. CHECK POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect BCM. Check voltage between BCM harness connector and ground. Is the measurement norma 3. CHECK GROUND CIRCUIT Check continuity between BCM harness connector and ground. Does continuity exist? DRIVER SEAT CONTROL UNIT DRIVER SEAT CONTROL UNIT : Diagnosis Procedure NOTE: Do not disconnect the battery negative terminal and the driver seat control unit connector until DTC is confirmed with CONSULT.

• Sliding switch

Description Sliding switch is equipped to the power seat switch LH on the seat frame. The operation signal is input to the driver seat control unit when the sliding switch is operated. Component Function Check 1. CHECK FUNCTION Select "SLIDE SW-FR", "SLIDE SW-RR" in "DATA MONITOR" mode with CONSULT. Check sliding switch signal under the following conditions. Is the indication normal? Diagnosis Procedure Regarding Wiring Diagram information, refer to ADP-150, "Wiring Diagram". 1. CHECK SLIDING SWITCH SIGNAL Turn ignition switch OFF. Check voltage between driver seat control unit harness connector and ground. Is the inspection result normal? 2.

• Reclining switch

Description Reclining switch is equipped to the power seat switch LH on the seat frame. The operation signal is input to the driver seat control unit when the reclining switch is operated. Component Function Check 1.CHECK FUNCTION Select "RECLN SW-FR", "RECLN SW-RR" in "DATA MONITOR" mode with CONSULT. Check reclining switch signal under the following conditions. Diagnosis Procedure Regarding Wiring Diagram information, refer to ADP-150, "Wiring Diagram". 1. CHECK RECLINING SWITCH SIGNAL Turn ignition switch OFF. Check voltage between driver seat control unit harness connector and ground. 2. CHECK RECLINING SWITCH CIRCUIT Turn ignition switch OFF.

• Lifting switch (front)

Description Lifting switch (front) is equipped to the power seat switch LH on the seat frame. The operation signal is input to the driver seat control unit when the lifting switch (front) is operated. Component Function Check 1. CHECK FUNCTION Select "LIFT FR SW-UP", "LIFT FR SW-DN" in "DATA MONITOR" mode with CONSULT. Check lifting switch (front) signal under the following conditions. Diagnosis Procedure Regarding Wiring Diagram information, refer to ADP-150, "Wiring Diagram". 1. CHECK LIFTING SWITCH SIGNAL Turn ignition switch OFF. Check voltage between driver seat control unit harness connector and ground. 2. CHECK LIFTING SWITCH (FRONT) CIRCUIT Turn ignition switch OFF.

• Lifting switch (rear)

Description Lifting switch (rear) is equipped to the power seat switch LH on the seat frame. The operation signal is inputted to the driver seat control unit when the lifting switch (rear) is operated. Component Function Check 1. CHECK FUNCTION Select "LIFT RR SW-UP", "LIFT RR SW-DN" in "DATA MONITOR mode with CONSULT. Check lifting switch (rear) signal under the following conditions. Diagnosis Procedure Regarding Wiring Diagram information, refer to ADP-150, "Wiring Diagram". 1. CHECK LIFTING SWITCH (REAR) SIGNAL Turn ignition switch OFF. Check voltage between driver seat control unit harness connector and ground 2. CHECK LIFTING SWITCH (REAR) CIRCUIT Turn ignition switch OFF.

• Tilt switch

Description ADP steering switch (tilt switch) is equipped to the steering column. The operation signal is input to the automatic drive positioner control unit when the tilt switch is operated. Component Function Check 1. CHECK FUNCTION Select "TILT SW-UP", "TILT SW-DOWN" in "DATA MONITOR" mode with CONSULT. Check tilt switch signal under the following conditions. Diagnosis Procedure Regarding Wiring Diagram information, refer to ADP-150, "Wiring Diagram". 1. CHECK TILT SWITCH SIGNAL Turn ignition switch OFF. Disconnect ADP steering switch (tilt switch). Check voltage between ADP steering switch harness connector and ground. 2.

• Telescopic switch

Description ADP steering switch (telescopic switch) is equipped to the steering column. The operation signal is input to the automatic drive positioner control unit when the telescopic switch is operated. Component Function Check 1. CHECK FUNCTION Select "TELESCO SW-FR", "TELESCO SW-RR" in "DATA MONITOR" mode with CONSULT. Check telescopic switch signal under the following conditions. Diagnosis Procedure Regarding Wiring Diagram information, refer to ADP-150, "Wiring Diagram". 1. CHECK TELESCOPIC SWITCH SIGNAL Turn ignition switch OFF. Disconnect ADP steering switch (telescopic switch). Check voltage between ADP steering switch harness connector and ground. 2.

• Seat memory switch

Description Seat memory switch is installed to the front door LH trim. The operation signal is input to the driver seat control unit when the seat memory switch is operated. Component Function Check 1. CHECK FUNCTION Select ""MEMORY SW 1", "MEMORY SW 2", "SET SW" in "DATA MONITOR" mode with CONSULT. Check seat memory switch signal under the following conditions. Diagnosis Procedure 1. CHECK SEAT MEMORY SWITCH SIGNAL Turn ignition switch OFF. Disconnect driver seat control unit. Check voltage between driver seat control unit harness connector and ground. 2. CHECK MEMORY SWITCH CIRCUIT Disconnect seat memory switch.

• Door mirror remote control switch

CHANGEOVER SWITCH CHANGEOVER SWITCH : Description Changeover switch is integrated into door mirror remote control switch. Changeover switch has three positions (L, N and R). It changes door mirror motor operation by transmitting control signal to automatic drive positioner control unit. CHANGEOVER SWITCH : Component Function Check 1. CHECK FUNCTION Select "MIR CHNG SW-R", "MIR CHNG SW-L" in "DATA MONITOR" mode with CONSULT. Check changeover switch signal under the following conditions. CHANGEOVER SWITCH : Diagnosis Procedure 1. CHECK CHANGEOVER SWITCH SIGNAL Turn ignition switch ON. Check voltage between automatic drive positioner control unit connector and ground. 2.

• Power seat switch ground circuit

Diagnosis Procedure 1. CHECK POWER SEAT SWITCH LH GROUND CIRCUIT Turn ignition switch OFF. Disconnect power seat switch LH. Check continuity between power seat switch LH connector and ground.

• Tilt &telescopic switch ground circuit

Diagnosis Procedure 1. CHECK ADP STEERING SWITCH (TILT & TELESCOPIC SWITCH) GROUND CIRCUIT Turn ignition switch OFF. Disconnect ADP steering switch (tilt & telescopic switch). Check continuity between ADP steering switch (tilt & telescopic switch) and ground.

• Front door switch (driver side)

Description Detects front door LH open/close condition. Component Function Check 1. CHECK FUNCTION Select "DOOR SW-FL" in "DATA MONITOR" mode with CONSULT. Check the front door switch signal under the following conditions Diagnosis Procedure 1. CHECK FRONT DOOR SWITCH LH CIRCUIT Turn ignition switch OFF. Disconnect BCM. Check continuity between BCM connector and front door switch LH connector.   Check continuity between BCM connector and ground.   2. CHECK FRONT DOOR SWITCH LH 3. CHECK INTERMITTENT INCIDENT Component Inspection 1. CHECK FRONT DOOR SWITCH LH Turn ignition switch OFF. Disconnect front door switch LH. Check continuity between front door switch LH terminals.

• Sliding sensor

Description The sliding sensor is installed to the seat frame. The pulse signal is input to the driver seat control unit when sliding is performed. The driver seat control unit counts the pulse and calculates the sliding amount of the seat. Component Function Check 1. CHECK FUNCTION Select "SLIDE PULSE" in "DATA MONITOR" mode with CONSULT. Check sliding sensor switch signal under the following conditions.   Diagnosis Procedure 1. CHECK SLIDING SENSOR SIGNAL Turn ignition switch ON. Read voltage signal between driver seat control unit harness connector and ground with oscilloscope. 2. CHECK SLIDING SENSOR CIRCUIT Turn ignition switch OFF.

• Reclining sensor

Description The reclining motor is installed to the seatback assembly. The pulse signal is input to the driver seat control unit when the reclining is operated. The driver seat control unit counts the pulse and calculates the reclining amount of the seat. Component Function Check 1. CHECK FUNCTION Select "RECLN PULSE" in "DATA MONITOR" mode with CONSULT. Check reclining sensor signal under the following conditions Diagnosis Procedure 1. CHECK RECLINING SENSOR SIGNAL Turn ignition switch ON. Read voltage signal between driver seat control unit harness connector and ground with oscilloscope. 2. CHECK RECLINING SENSOR CIRCUIT Turn ignition switch OFF.

• Lifting sensor (front)

Description The lifting sensor (front) is installed to the seat frame. The pulse signal is input to the driver seat control unit when the lifting (front) is operated. The driver seat control unit counts the pulse and calculates the lifting (front) amount of the seat. Component Function Check 1.CHECK FUNCTION Select "LIFT FR PULSE" in "DATA MONITOR" mode with CONSULT. Check the lifting sensor (front) signal under the following conditions. Diagnosis Procedure 1. CHECK LIFTING SENSOR (FRONT) SIGNAL Turn ignition switch ON. Read the voltage signal between driver seat control unit harness connector and ground with an oscilloscope. 2. CHECK LIFTING SENSOR (FRONT) CIRCUIT Turn ignition switch OFF.

• Lifting sensor (rear)

Description The lifting sensor (rear) is installed to the seat frame. The pulse signal is input to the driver seat control unit when the lifting (rear) is operated. The driver seat control unit counts the pulse and calculates the lifting (rear) amount of the seat. Component Function Check 1. CHECK FUNCTION Select "LIFT RR PULSE" in "DATA MONITOR" mode with CONSULT. Check lifting sensor (rear) signal under the following conditions Diagnosis Procedure 1. CHECK LIFTING SENSOR (REAR) SIGNAL Turn ignition switch ON. Read voltage signal between driver seat control unit harness connector and ground with oscilloscope. 2. CHECK LIFTING SENSOR (REAR) CIRCUIT Turn ignition switch OFF.

• Tilt sensor

Description The tilt sensor is installed to the steering column assembly. The pulse signal is input to the driver seat control unit when the tilt is operated. The driver seat control unit counts the pulse and calculates the tilt amount of the steering column. Component Function Check 1.CHECK FUNCTION Select "TILT PULSE" in "DATA MONITOR" mode with CONSULT. Check tilt sensor signal under the following conditions. Diagnosis Procedure 1. CHECK TILT SENSOR SIGNAL Turn ignition switch ON. Check voltage signal between driver seat control unit connector and ground with oscilloscope. 2. CHECK TILT SENSOR CIRCUIT Turn ignition switch OFF. Disconnect driver seat control unit and tilt motor.

• Telescopic sensor

Description The telescopic sensor is installed to the steering column assembly. The pulse signal is input to the driver seat control unit when telescopic is performed. The driver seat control unit counts the pulse and calculates the telescopic amount of the steering column. Component Function Check 1.CHECK FUNCTION Select "TELESCO PULSE" in "DATA MONITOR" mode with CONSULT. Check telescopic sensor signal under the following conditions. Diagnosis Procedure 1. CHECK TELESCOPIC SENSOR SIGNAL Turn ignition switch ON. Check voltage signal between driver seat control unit connector and ground with oscilloscope. 2. CHECK TELESCOPIC SENSOR CIRCUIT Turn ignition switch OFF.

• Mirror sensor

DRIVER SIDE DRIVER SIDE : Description The mirror sensor LH is installed to the door mirror LH. The resistance of 2 sensors (horizontal and vertical) is changed when the door mirror LH is operated. Automatic drive positioner control unit calculates the door mirror position according to the change of the voltage of 2 sensor input terminals. DRIVER SIDE : Component Function Check 1. CHECK FUNCTION Select "MIR/SEN LH U-D", "MIR/SEN LH R-L" in "DATA MONITOR" with CONSULT. Check mirror sensor (driver side) signal under the following condition. DRIVER SIDE : Diagnosis Procedure 1. CHECK DOOR MIRROR LH SENSOR SIGNAL Turn ignition switch to ACC.

• Sliding motor

Description The sliding motor LH is installed to the seat frame. The sliding motor LH is activated with the driver seat control unit. The seat is slid forward/backward by changing the rotation direction of sliding motor LH. Component Function Check 1. CHECK FUNCTION Select "SEAT SLIDE" in "ACTIVE TEST" mode with CONSULT. Check the sliding motor LH operation. Diagnosis Procedure 1. CHECK SLIDING MOTOR LH POWER SUPPLY Turn the ignition switch to ACC. Perform "ACTIVE TEST" ("SEAT SLIDE") with CONSULT. Check voltage between driver seat control unit harness connector and ground. 2. CHECK SLIDING MOTOR LH CIRCUIT Turn ignition switch OFF.

• Reclining motor

Description The reclining motor is installed to the seatback assembly. The reclining motor is activated with the driver seat control unit. The seatback is reclined forward/backward by changing the rotation direction of reclining motor. Component Function Check 1. CHECK FUNCTION Select "SEAT RECLINING" in "ACTIVE TEST" mode with CONSULT. Check the reclining motor LH operation.   Diagnosis Procedure 1. CHECK RECLINING MOTOR POWER SUPPLY Turn the ignition switch to ACC. Perform "ACTIVE TEST" ("SEAT RECLINING") with CONSULT. Check voltage between driver seat control unit harness connector and ground. 2. CHECK RECLINING MOTOR CIRCUIT Turn ignition switch OFF.

• Lifting motor (front)

Description The lifting motor (front) is installed to the seat frame. The lifting motor (front) is activated with the driver seat control unit. The lifter (front) is moved upward/downward by changing the rotation direction of lifting motor (front). Component Function Check 1. CHECK FUNCTION Select "SEAT LIFTER FR" in "ACTIVE TEST" mode with CONSULT. Check the lifting motor (front) operation. Diagnosis Procedure 1. CHECK LIFTING MOTOR (FRONT) POWER SUPPLY Turn the ignition switch to ACC. Perform "ACTIVE TEST" ("SEAT LIFTER FR") with CONSULT. Check voltage between driver seat control unit harness connector and ground. 2. CHECK LIFTING MOTOR (FRONT) CIRCUIT Turn ignition switch OFF.

• Lifting motor (rear)

Description The lifting motor (rear) is installed to the seat frame. The lifting motor (rear) is activated with the driver seat control unit. The seat lifter (rear) is moved upward/downward by changing the rotation direction of lifting motor (rear). Component Function Check 1. CHECK FUNCTION Select "SEAT LIFTER RR" in "ACTIVE TEST" mode with CONSULT. Check the lifting motor (rear) operation. Diagnosis Procedure 1. CHECK LIFTING MOTOR (REAR) POWER SUPPLY Turn the ignition switch to ACC. Perform "ACTIVE TEST" ("SEAT LIFTER RR") with CONSULT. Check voltage between driver seat control unit harness connector and ground. 2. CHECK LIFTING MOTOR (REAR) CIRCUIT Turn ignition switch OFF.

• Tilt motor

Description The tilt motor is installed to the steering column assembly. The tilt motor is activated with the automatic drive positioner control unit. The steering column is tilted upward/downward by changing the rotation direction of tilt motor. Component Function Check 1. CHECK FUNCTION Select "TILT MOTOR" in "ACTIVE TEST" mode with CONSULT. Check the tilt motor operation. Diagnosis Procedure 1. CHECK TILT MOTOR POWER SUPPLY Turn ignition switch OFF. Disconnect tilt motor. Turn the ignition switch ON. Perform "ACTIVE TEST" ("TILT MOTOR") with CONSULT. Check voltage between tilt motor harness connector and ground. 2. CHECK TILT MOTOR CIRCUIT Turn ignition switch OFF.

• Telescopic motor

Description The telescopic motor is installed to the steering column assembly. The telescopic motor is activated with the automatic drive positioner control unit. Compresses the steering column by changing the rotation direction of telescopic motor. Component Function Check 1.CHECK FUNCTION Select "TELESCO MOTOR" in "ACTIVE TEST" mode with CONSULT. Check the telescopic motor operation Diagnosis Procedure 1. CHECK TELESCOPIC MOTOR POWER SUPPLY Turn ignition switch OFF. Disconnect tilt motor. Turn the ignition switch ON. Perform "ACTIVE TEST" ("TELESCO MOTOR") with CONSULT. Check voltage between telescopic motor harness connector and ground. 2.CHECK TELESCOPIC MOTOR Turn ignition switch OFF.

• Door mirror motor

Description It makes mirror face operate from side to side and up and down with the electric power that automatic drive positioner control unit supplies. Component Function Chec 1. CHECK DOOR MIRROR MOTOR FUNCTION Check the operation with "MIRROR MOTOR RH" and "MIRROR MOTOR LH" in "ACTIVE TEST" mode with CONSULT. Diagnosis Procedure 1. CHECK DOOR MIRROR MOTOR INPUT SIGNAL Turn ignition switch ON. Check voltage between door mirror connector and ground. 2. CHECK HARNESS CONTINUITY Turn ignition switch OFF. Disconnect automatic drive positioner control unit and door mirror. Check continuity between automatic drive positioner control unit connector and door mirror connector.

• Seat memory indicator lamp

Description Memory switch is equipped on the seat memory switch installed to the driver side door trim. The operation signal is input to the driver seat control unit when the memory switch is operated. The status of automatic drive positioner system can be checked according to the illuminating/flashing status. Component Function Check 1. CHECK FUNCTION Select "MEMORY SW INDCTR" in "ACTIVE TEST" mode with CONSULT. Check the memory indicator operation. Diagnosis Procedure 1. CHECK SEAT MEMORY INDICATOR CIRCUIT Turn ignition switch OFF. Disconnect driver seat control unit and seat memory switch.