DTC C1294 Brake Lamp Switch Circuit Always Active. Chevrolet Corvette 1997

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1997 🢒 Corvette 🢒 Brakes 🢒 ABS Brakes - Delco/Bosch 🢒 DTC C1294 Brake Lamp Switch Circuit Always Active

ABS Components
ABS/TCS Schematics

Circuit Description

This DTC occurs when internal self checking safety logic has determined that the Stoplamp Switch is continuously ON. This is important because the TCS can not be activated when the Stoplamp Switch is ON.

Conditions for Setting the DTC

DTC C1294 can be set if the vehicle speed reaches at least 40 km/h (25 mph). If the brake was never OFF during two consecutive drive cycles, a malfunction exists.

Action Taken When the DTC Sets

A malfunction DTC is stored, TCS is disabled and the Traction Control indicator is turned ON. ABS remains functional.

Conditions for Clearing the DTC

•	Condition for DTC is no longer present and scan tool clear DTC function is used.

•	Fifty ignition cycles have passed with no DTC(s) detected.

Diagnostic Aids

•	It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

•	Possible causes:

-	Stoplamp switch circuit shorted to voltage.

-	Stoplamp switch misadjusted or shorted.

-	Binding pedal.

DTC C1294 Brake Lamp Switch Circuit Always Active

Step	Action	Value(s)	Yes	No
1	Was the Diagnostic System Check performed?	--	Go to Step 2	Go to Diagnostic System Check
2	Observe rear brake lamps. Are brake lamps OFF?	--	Go to Step 4	Go to Step 3
3	Disconnect the Stoplamp switch connector. Are the brake lamps ON?	--	Go to Step 6	Go to Step 7
4	Disconnect the EBTCM harness connector. Install J 39700 Universal Pinout Box using the J 39700-25 adapter cable to the EBTCM harness connector only. Using J 39200 DMM, measure the voltage between the J 39700 terminals 9 and B. Is the voltage within the range specified in the value(s) column?	Greater than 1 V	Go to Step 6	Go to Step 5
5	Turn the ignition switch to the OFF position. Inspect CKT 20 and the EBTCM harness connector for damage which may result in a short to voltage with all connector connected. Reconnect all connectors. Carefully drive vehicle for three drive cycles while monitoring a scan tool. A drive cycle consists of starting the engine, driving above 40 km/h (25 mph) back to 0 km/h (0 mph) and then turning the ignition OFF. Was DTC C1294 set in the last three drive cycles?	--	Go to Step 8	Go to Diagnostic System Check
6	Repair short to voltage in CKT 20. Refer to Wiring Repairs in Wiring Systems. Is the repair complete?	--	Go to Diagnostic System Check	--
7	Adjust or replace the Stoplamp switch as necessary. Refer to Stop Lamp Switch Adjustment in Hydraulic Brakes. Is the repair complete?	--	Go to Diagnostic System Check	--
8	Replace the EBTCM. Refer to Electronic Brake and Traction Control Module . Is the replacement complete?	--	Go to Diagnostic System Check	--