Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

• U1000 can comm circuit

Description CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicles are equipped with many electronic control units, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. CAN Communication Signal Chart.

• U1010 control unit (CAN)

DTC Logic DTC DETECTION LOGIC Diagnosis Procedure 1. REPLACE BCM When DTC [U1010] is detected, replace BCM. Special Repair Requirement 1. REQUIRED WORK WHEN REPLACING BCM Initialize NVIS by CONSULT.

• B2622 inside key antenna 2

Description Detects whether Intelligent Key is inside the vehicle. Installed under the center console. DTC Logic NOTE: The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II User Guide for additional information. Check Intelligent Key relative signal strength Confirm vehicle Intelligent Key antenna signal strength DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT Perform front console antenna INSIDE ANT DIAGNOSIS on "Work Support" of "INTELLIGENT KEY". Perform "INTELLIGENT KEY" Self Diagnostic Result.

• B2623 inside key antenna 3

Description Detects whether Intelligent Key is inside the vehicle. Installed in the trunk room. DTC Logic NOTE: The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II User Guide for additional information. Check Intelligent Key relative signal strength Confirm vehicle Intelligent Key antenna signal strength DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT Perform rear parcel shelf antenna INSIDE ANT DIAGNOSIS on "Work Support" of "INTELLIGENT KEY". Perform "INTELLIGENT KEY" Self Diagnostic Result.

• Power supply and ground circuit

Diagnosis Procedure 1. CHECK FUSE AND FUSIBLE LINK Check if the following BCM fuses or fusible link are blown 2. CHECK POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect BCM. Check voltage between BCM harness connector and ground. 3. CHECK GROUND CIRCUIT Check continuity between BCM harness connector and ground. Special Repair Requirement 1.

• Door switch

Description Detects door open/close condition. Component Function Check 1. CHECK FUNCTION With CONSULT Check door switches DOOR SW-DR, DOOR SW-AS, DOOR SW-RL, DOOR SW-RR in Data Monitor mode with CONSULT. Diagnosis Procedure 1. CHECK DOOR SWITCH INPUT SIGNAL Turn ignition switch OFF. Check signal between BCM connector and ground with oscilloscope. 2. CHECK DOOR SWITCH CIRCUIT Disconnect BCM connector. Check continuity between BCM connector and door switch connector. Check continuity between BCM connector and ground 3. CHECK DOOR SWITCH 4. CHECK INTERMITTENT INCIDENT Component Inspection 1. CHECK DOOR SWITCH Turn ignition switch OFF. Disconnect door switch connector. Check door switch.

• Door lock and unlock switch

DRIVER SIDE DRIVER SIDE : Description Transmits door lock/unlock operation to BCM. DRIVER SIDE : Component Function Check 1. CHECK FUNCTION With CONSULT Check CDL LOCK SW, CDL UNLOCK SW in Data Monitor mode with CONSULT DRIVER SIDE : Diagnosis Procedure 1. CHECK POWER WINDOW SWITCH OUTPUT SIGNAL Read voltage signal between BCM connector and ground with oscilloscope when door lock and unlock switch (driver side) is turned "LOCK" or "UNLOCK". Check that signals which are shown in the figure below can be detected during 10 second just after door lock and unlock switch (driver side) is turned to "LOCK" or "UNLOCK". 2. CHECK POWER WINDOW SWITCH GROUND Turn ignition switch OFF.

• Key slot

Description Detects whether Intelligent Key is inserted. Immobilizer antenna amp checks Intelligent Key transponder. Component Function Check 1. CHECK FUNCTION With CONSULT Check KEY SW -SLOT in Data Monitor mode with CONSULT. Diagnosis Procedure 1. CHECK KEY SLOT POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect key slot connector. Check voltage between key slot connector and ground. 2. CHECK KEY SLOT GROUND CIRCUIT Check continuity between key slot connector and ground. 3. CHECK KEY SLOT CIRCUIT Disconnect BCM connector. Check continuity between BCM connector and key slot connector. Check continuity between BCM connector and ground. 4. CHECK KEY SLOT 5.

• Key cylinder switch

Description The main power window and door lock/unlock switch detects condition of the door key cylinder switch and transmits to BCM as the LOCK or UNLOCK signal. Component Function Check 1. CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL Check KEY CYL UN-SW, KEY CYL UN-SW in "DATA MONITOR" mode for "POWER DOOR LOCK SYSTEM" with CONSULT. Diagnosis Procedure 1. CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL Turn ignition switch ON. Check voltage between main power window and door lock/unlock switch connector and ground. 2. CHECK DOOR KEY CYLINDER SIGNAL CIRCUIT Turn ignition switch OFF.

• Unlock sensor

Description Detects door lock condition of driver door. Component Function Check 1. CHECK FUNCTION With CONSULT Check unlock sensor UNLK SEN−DR in "Data Monitor" mode. Diagnosis Procedure 1. CHECK UNLOCK SENSOR POWER SUPPLY Check signal between BCM connector and ground with oscilloscope. 2. CHECK UNLOCK SENSOR CIRCUIT Turn ignition switch OFF. Disconnect BCM and front door lock assembly LH connector. Check continuity between BCM connector and front door lock assembly LH connector. Check continuity between BCM connector and ground. 3. CHECK UNLOCK SENSOR GROUND CIRCUIT Check continuity between front door lock assembly LH connector and grou 4.

• Trunk lid opener switch

Description Transmits trunk lid open signal to BCM. Component Function Check 1. CHECK TRUNK LID OPENER CANCEL SWITCH Check trunk lid opener cancel switch position. 2. CHECK FUNCTION With CONSULT Check trunk lid opener switch TR/BD OPEN SW in Data Monitor mode with CONSULT. When trunk lid opener switch is turned to "ON". Diagnosis Procedure 1. CHECK TRUNK LID OPEN INPUT SIGNAL Remove Intelligent Key from key slot. Turn on trunk lid opener cancel switch. Check voltage between BCM connector and ground. 2. CHECK TRUNK LID OPENER SWITCH CIRCUIT Disconnect BCM connector Check continuity between BCM connector and trunk lid opener switch connector. Check continuity between BCM connector and ground.

• Trunk lid opener cancel switch

Description Cancels trunk lid open operation. Component Function Check 1. CHECK FUNCTION With CONSULT Check trunk lid opener cancel switch TR CANCEL SW in Data Monitor mode with CONSULT. Diagnosis Procedure 1. CHECK TRUNK LID OPENER CANCEL SIGNAL Check voltage between BCM connector and ground. 2. CHECK TRUNK LID OPENER CANCEL SWITCH CIRCUIT Disconnect BCM connector. Check continuity between BCM connector and trunk lid opener cancel switch connector Check continuity between BCM connector and ground. 3. CHECK TRUNK LID OPENER CANCEL SWITCH GROUND CIRCUIT Check continuity between trunk lid opener switch connector and ground 4. CHECK TRUNK LID OPENER CANCEL SWITCH 5.

• Trunk lamp switch

Description Detects trunk open/close condition. Component Function Check 1. CHECK FUNCTION With CONSULT Check TRNK/HAT MNTR in Data Monitor mode with CONSULT. Diagnosis Procedure 1. CHECK TRUNK LAMP SWITCH INPUT SIGNAL Turn ignition switch OFF. Check voltage between BCM connector and ground 2. CHECK TRUNK LAMP SWITCH CIRCUIT Disconnect BCM connector. Check continuity between BCM connector and trunk lamp switch and trunk release solenoid connector. Check continuity between BCM connector and ground 3. CHECK TRUNK LAMP SWITCH GROUND CIRCUIT Check continuity between trunk lid lock assembly connector and ground. 4. CHECK BCM OUTPUT SIGNAL Insure trunk remains closed during this step.

• Door request switch

Description Transmits door lock/unlock operation to BCM. Component Function Check 1. CHECK FUNCTION With CONSULT Check door request switch REQ SW-DR, REQ SW-AS in Data Monitor mode. Diagnosis Procedure 1. CHECK DOOR REQUEST SWITCH OUTPUT SIGNAL Turn ignition switch OFF. Check voltage between BCM harness connector and ground. 2. CHECK DOOR REQUEST SWITCH CIRCUIT Disconnect BCM and front outside handle connector. Check continuity between BCM connector and front outside handle connector. Check continuity between BCM connector and ground. 3. CHECK DOOR REQUEST SWITCH GROUND CIRCUIT Check continuity between front outside handle connector and ground. 4.

• Trunk opener request switch

Description Performs trunk lid open request when it is pressed. Component Function Check 1. CHECK FUNCTION With CONSULT Check trunk opener request switch REQ SW -BD/TR in Data Monitor mode. Diagnosis Procedure 1. CHECK TRUNK OPENER REQUEST SWITCH OUTPUT SIGNAL Turn ignition switch OFF. Check voltage between BCM connector and ground. 2. CHECK TRUNK OPENER REQUEST SWITCH CIRCUIT Disconnect BCM and trunk opener request switch connector. Check continuity between BCM connector and trunk opener request switch connector Check continuity between BCM connector and ground. 3. CHECK TRUNK OPENER REQUEST SWITCH GROUND CIRCUIT Check continuity between trunk opener request switch connector and ground. 4.

• Door lock actuator

DRIVER SIDE DRIVER SIDE : Description Locks/unlocks the door with the signal from BCM. DRIVER SIDE : Component Function Check 1. CHECK FUNCTION Use CONSULT to perform Active Test ("DOOR LOCK"). Touch "ALL LOCK" or "ALL UNLOCK" to check that it works normally. DRIVER SIDE : Diagnosis Procedure 1. CHECK OUTPUT SIGNAL Check voltage between BCM connector and ground 2. CHECK DOOR LOCK ACTUATOR CIRCUIT Turn ignition switch OFF. Disconnect BCM and front door lock actuator driver side connector. Check continuity between BCM connector and front door lock actuator driver side connector. Check continuity between BCM connector and ground. 3.

• Trunk release solenoid

Description Performs trunk lid open with signal from BCM. Component Function Check 1. CHECK TRUNK LID OPENER CANCEL SWITCH Check trunk lid opener cancel switch position. 2. CHECK FUNCTION Perform Active Test TRUNK/GLASS HATCH with CONSULT. Touch "OPEN" and check that trunk lid opens Diagnosis Procedure 1. CHECK OUTPUT CIRCUIT Turn ignition switch OFF. Disconnect trunk lamp switch and trunk release solenoid connector. Check voltage between trunk lamp switch and trunk release solenoid connector and ground. 2. CHECK TRUNK LID OPENER ACTUATOR CIRCUIT Disconnect BCM. Check continuity between BCM connector and trunk lamp switch and trunk release solenoid connector.

• Intelligent key warning buzzer

Description Answers back and warns for an inappropriate operation. Component Function Check 1. CHECK FUNCTION With CONSULT Check Intelligent Key warning buzzer OUTSIDE BUZZER in Active Test mode. Diagnosis Procedure 1. CHECK INTELLIGENT KEY WARNING BUZZER Check voltage between BCM connector and ground. 2. CHECK INTELLIGENT KEY WARNING BUZZER POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect Intelligent Key warning buzzer connector. Check voltage between Intelligent Key warning buzzer connector and ground. 3. CHECK INTELLIGENT KEY WARNING BUZZER CIRCUIT Disconnect BCM connector. Check continuity between BCM connector and Intelligent Key warning buzzer connector.

• Outside key antenna

Description Detects whether Intelligent Key is outside the vehicle. Integrated in front outside handle (driver side, passenger side) and installed in rear bumper. Component Function Check NOTE: The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II User Guide for additional information. Check Intelligent Key relative signal strength Confirm vehicle Intelligent Key antenna signal strength 1. CHECK DOOR REQUEST SWITCH Check that door request switch operates normally 2. CHECK FUNCTION Be sure that Intelligent Key is in each outside key antenna detection range.

• Remote keyless entry receiver

Description Receives Intelligent Key operation and transmits to BCM. Component Function Check 1. CHECK FUNCTION With CONSULT Check remote keyless entry receiver RKE OPE COUN1 in Data Monitor mode with CONSULT Diagnosis Procedure 1. CHECK REMOTE KEYLESS ENTRY RECEIVER OUTPUT SIGNAL Turn ignition switch OFF. Check signal between remote keyless entry receiver connector and ground with oscilloscope. 2. CHECK REMOTE KEYLESS ENTRY RECEIVER POWER SUPPLY Disconnect remote keyless entry receiver connector. Check voltage between remote keyless entry receiver connector and ground. 3. CHECK REMOTE KEYLESS ENTRY RECEIVER CIRCUIT 1 Disconnect BCM connector.

• Intelligent key

Description The following functions are available when having and carrying the Intelligent Key. Door lock/unlock Trunk open Remote control entry function and panic alarm function are available when operating the remote buttons. Component Function Check NOTE: The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II User Guide for additional information. Check Intelligent Key relative signal strength Confirm vehicle Intelligent Key antenna signal strength 1. CHECK FUNCTION With CONSULT Check remote keyless entry receiver RKE OPE COUN1 in Data Monitor mode with CONSULT.

• Key slot illumination

Description Blinks when Intelligent Key insertion is required. Component Function Check 1. CHECK FUNCTION With CONSULT Check key slot illumination KEY SLOT ILLUMI in Active Test mode. Diagnosis Procedure 1. CHECK KEY SLOT ILLUMINATION OUTPUT SIGNAL Check voltage between key slot connector and ground. 2. CHECK KEY SLOT POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect key slot connector. Check voltage between slot connector and ground. 3. CHECK KEY SLOT GROUND CIRCUIT Check continuity between key slot connector and ground. 4. CHECK KEY SLOT CIRCUIT Disconnect BCM and key slot connector. Check continuity between BCM connector and key slot connector.

• Horn function

Description Perform answer-back for each operation with horn. Component Function Check 1. CHECK FUNCTION Select HORN in "ACTIVE TEST" mode with CONSULT. Check the horn (high/low) operation. Diagnosis Procedure 1. CHECK HORN FUNCTION Check horn function with horn switch 2. CHECK HORN RELAY POWER SUPPLY Turn ignition switch ON. Perform "ACTIVE TEST" ("HORN") with CONSULT. Using an oscilloscope or analog voltmeter, check voltage between IPDM E/R connector and ground. 3.

• Combination meter display function

Description Displays each operation method guide and warning for system malfunction. Component Function Check 1. CHECK FUNCTION With CONSULT Check the operation with ("LCD") in the Active Test. Diagnosis Procedure 1. CHECK COMBINATION METER 2.

• Warning chime function

Description Performs operation method guide and warning with buzzer. Component Function Check 1. CHECK FUNCTION With CONSULT Check the operation with "INSIDE BUZZER" in the Active Test. Touch "TAKE OUT", "KNOB"or "KEY"on screen. Diagnosis Procedure 1. CHECK METER BUZZER CIRCUIT 2.

• Hazard function

Description Perform answer-back for each operation with number of blinks. Component Function Check 1. CHECK FUNCTION Check hazard warning lamp ("FLASHER") in Active Test. Diagnosis Procedure 1. CHECK HAZARD SWITCH CIRCUIT Operate the hazard lights by turning ON the hazard warning switch. 2.

• Homelink universal transceiver

Description Homelink universal transceiver can store and transmit a maximum of 3 radio signals. Allows operation of garage doors, gates, home and office lighting, entry door locks and security system, etc. Homelink universal transceiver power supply uses vehicle battery, which enables it to maintain every program in case battery is discharged or removed. Component Function Check 1. CHECK FUNCTION Check that system receiver (garage door opener, etc. ) operates with original hand-held transmitter 2. CHECK ILLUMINATE Turn ignition switch "OFF". Press each of the transmitter buttons and watch for the red light to illuminate with each button. 3. CHECK TRANSMITTER Check transmitter with Tool*.