DTC C0288 or C088 Brake Warning Lamp Circuit Shorted to B+. Chevrolet Chevy C Pickup

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy C Pickup - 2WD 🢒 DTC 🢒 DTC C0288 or C088 Brake Warning Lamp Circuit Shorted to B+

ABS Components
Antilock Brake System Schematics

Circuit Description

The red BRAKE warning lamp is supplied ignition voltage through the GAUGES fuse. The BRAKE warning lamp can be illuminated by the EBCM, Daytime Running Lights Module (DRL) or Brake Pressure Warning Switch. If a DTC C0288 sets, the EBCM will store in memory but will not disable the ABS. If a DTC C0288 is in memory, the EBCM will not attempt to perform a BRAKE warning lamp bulb check at startup. Also the EBCM will not attempt to use the BRAKE indicator lamp as a backup if the ABS indicator lamp operation is inhibited by a DTC C0286.

Conditions for Setting the DTC

•	High voltage is present on the BRAKE warning lamp circuit when the circuit is expected to be low (lamp commanded on by the EBCM)

•	Anything that keeps the Brake warning lamp circuit high when the lamp is supposed to be illuminated (such as a short to voltage on CKT 33)

Action Taken When the DTC Sets

No action taken, the ABS is not disabled.

Conditions for Clearing the MIL/DTC

•	Repair the conditions responsible for setting the DTC

•	Use the Scan Tool Clear DTCs function

Diagnostic Aids

DTC C0288 is usually set by a short to voltage in the wiring between the brake warning lamp and the EBCM.

Test Description

The numbers below refer to the steps in the diagnostic table.

Determines if the BRAKE warning lamp circuit is operating properly when controlled by the EBCM (with diesel engines).

This step determines which variation of circuitry the vehicle is equipped.

This step determines if the BRAKE warning lamp circuit is operating properly without the EBCM (with diesel engines).

This step decides between a constant or intermittent short to voltage condition.

This step determines if the BRAKE warning lamp circuit is operating properly without the EBCM (with gas engines).

This step decides between a constant or intermittent short to voltage condition.

Step

Action

Value(s)

Yes

Was the ABS Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - ABS

Turn the ignition to RUN.
Observe the red BRAKE warning lamp.

Did the BRAKE warning lamp turn on and then off after 2 seconds?

Go to Step 6

Go to Step 3

Take note of the GVW rating of the vehicle.

Is the vehicle rated at over 15,000 GVW?

Go to Step 4

Go to Step 9

Turn the ignition to OFF.
Disconnect the 10-way EBCM harness connector from the EBCM.
Using a 3 amp fused jumper wire, such as J 36169-A , connect terminal H of the 10-way EBCM harness connector to ground.
Turn the ignition to RUN.

Does the BRAKE warning lamp turn on?

Go to Step 7

Go to Step 5

Inspect the jumper wire fuse

Is the fuse open?

Go to Step 8

Go to Step 6

The malfunction is intermittent.

Perform the following:

•	Inspect all connectors and harnesses for damage which may result in a short to voltage when all components are connected.

•	Refer to Diagnostic Aids.

•	Perform all necessary repairs.

Is repair complete?

Go to Diagnostic System Check - ABS

Replace the EBCM. Refer to Electronic Brake Control Module Replacement .

Is repair complete?

Go to Diagnostic System Check - ABS

Repair a short to voltage in CKT 680.

Is repair complete?

Go to Diagnostic System Check - ABS

Turn the ignition to OFF.
Disconnect the 10-way EBCM harness connector from the EBCM.
Using a 3 amp fused jumper wire, such as J 36169-A , connect terminal F of the 10-way EBCM harness connector to ground.
Turn the ignition to RUN.

Does the BRAKE warning lamp turn on?

Go to Step 7

Go to Step 10

Inspect the jumper wire fuse

Is the fuse open?

Go to Step 11

Go to Step 6

Repair a short to voltage in CKT 33.

Is repair complete?

Go to Diagnostic System Check - ABS