C1782

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1782/82: Stop Light Switch Circuit

DTC C1782/82 - Stop Light Switch Circuit

DESCRIPTION

When the brake pedal is depressed, the stop light comes on and the signal is input to the STP terminal of the suspension control ECU.

HINT: This DTC is output only when the sensor signal check is done.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT STOP LIGHT
(a) Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.
OK:
Stop light operates normally.

NG -- INSPECT STOP LIGHT SWITCH
OK -- Continue to next step.

2. INSPECT SUSPENSION CONTROL ECU




(a) Remove the suspension control ECU with connectors still connected.
(b) Measure the voltage between terminal S14-12 (STP) of the suspension control ECU and body ground when the stop light switch is ON and OFF.
Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SUSPENSION CONTROL ECU
3. INSPECT STOP LIGHT SWITCH
(a) Disconnect the stop light switch assembly connector.








(b) Check resistance between terminals 1 and 2 of the stop light switch assembly.
Standard resistance:





NG -- REPLACE STOP LIGHT SWITCH
OK -- Continue to next step.

4. INSPECT SUSPENSION CONTROL ECU




(a) Remove the suspension control ECU with connectors still connected.
(b) Measure the voltage between terminal S14-12 (STP) of the suspension control ECU and body ground when the stop light switch is ON and OFF.
Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SUSPENSION CONTROL ECU