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 lights come on and the signal is sent to the STP terminal of suspension control ECU.
When inspecting by test mode, the suspension control ECU scans changes to the signals. If there is no change, it outputs the test DTC (C1782/82).






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK STOP LIGHT SWITCH OPERATION
(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 switch functions normally.
NG -- INSPECT STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
2. INSPECT SUSPENSION CONTROL ECU





(a) Disconnect the suspension control ECU S15 connector.
(b) Measure the voltage according to the values in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SUSPENSION CONTROL ECU
3. INSPECT STOP LIGHT SWITCH ASSEMBLY





(a) Disconnect the stop light switch assembly connector.
(b) Measure the voltage according to the values in the table below.
Standard resistance:






NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
4. INSPECT SUSPENSION CONTROL ECU





(a) Disconnect the suspension control ECU S15 connector.
(b) Measure the voltage according to the values in the table below.
Standard voltage:






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