Description
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).
Refer to EC-68, "System Diagram" for the ASCD function.
DTC Logic
DTC DETECTION LOGIC
NOTE:
1st trip DTC is erased when ignition switch is turned OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
NOTE: The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B can be detected.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
CAUTION: Always drive vehicle at a safe speed.
NOTE: This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.
With GST
Follow the procedure "With CONSULT" above.
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
CAUTION: Always drive vehicle at a safe speed.
NOTE: This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.
With GST
Follow the procedure "With CONSULT" above.
Diagnosis Procedure
Regarding Wiring Diagram information, refer to EC-554, "Wiring Diagram".
1.CHECK OVERALL FUNCTION-I
With CONSULT
Without CONSULT
2.CHECK OVERALL FUNCTION-II
With CONSULT
Check "BRAKE SW2" indication in "DATA MONITOR" mode.
Without CONSULT
Check the voltage between ECM harness connectors.
3.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
4.DETECT MALFUNCTIONING PART
Check the following.
5.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
6.DETECT MALFUNCTIONING PART
Check the following.
7.CHECK ASCD BRAKE SWITCH
8.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
9.DETECT MALFUNCTIONING PART
Check the following.
10.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
11.DETECT MALFUNCTIONING PART
Check the following.
12.CHECK STOP LAMP SWITCH
13.CHECK INTERMITTENT INCIDENT
Component Inspection (ASCD Brake Switch)
1.CHECK ASCD BRAKE SWITCH-I
2.CHECK ASCD BRAKE SWITCH-II
Component Inspection (Stop Lamp Switch)
1.CHECK STOP LAMP SWITCH-I
2.CHECK STOP LAMP SWITCH-II
B2557 vehicle speed
Description
BCM receives the 2 vehicle speed signals via CAN
communication. One signal is transmitted by the "combination
meter". Another signal is transmitted by "ABS actuator and electric unit
(control unit)". BCM compares
both signals to detect the vehicle speed.
DTC Logic
DTC DETECTIO ...
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" i ...
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 ...