DTC C1287 Brake Warning Indicator Circuit Open or Shorted to Voltage. Chevrolet Lumina 2000

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2000 🢒 Lumina 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C1287 Brake Warning Indicator Circuit Open or Shorted to Voltage

ABS Components
Antilock Brake System Schematics
Power Distribution Schematics
Power Distribution Schematics
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice

Circuit Description

DTC C1287 identifies one of the following conditions:

•	An open or short to voltage between the EBCM and the red BRAKE warning indicator.

•	An open driver that does not allow the EBCM to illuminate the red BRAKE warning indicator.

DTC C1287 will only occur if an ABS malfunction is detected that may degrade base brake operation.

A short to ground in the circuit cannot be detected because the EBCM is not the only device controling the red BRAKE warning indicator. The following components may also turn on the red BRAKE warning indicator:

•	The parking brake indicator switch

•	The brake fluid level indicator sensor

Conditions for Setting the DTC

DTC C1287 can set during the three second bulb check and after completing initialization.

A malfunction exists if the red BRAKE warning indicator circuit voltage is out of specification. If the circuit voltage is out of specification, an open circuit or a short to voltage exists.

Action Taken When the DTC Sets

•	A malfunction DTC stores.

•	The ABS does not disable.

•	The amber ABS warning indicator will flash to indicate a serious problem if the following conditions occur:

1.	The EBCM commands the red BRAKE warning indicator on due to an ABS malfunction that may degrade base brake operation.

2.	The red BRAKE warning indicator cannot turn on.

Conditions for Clearing the DTC

•	The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.

•	100 drive cycles pass with no DTCs detected.

Diagnostic Aids

The following conditions may cause an intermittent malfunction:

•	A poor connection

•	Rubbed-through wire insulation

•	A broken wire inside the insulation

Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual or Scan Tool Diagnostics in this ABS section for the procedure. If the Scan Tool is not available, lift the parking brake handle in order to verify proper indicator operation and continuity of CKT 33 and CKT 39.

Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:

•	Backed out terminals

•	Improper mating

•	Improperly formed or damaged terminals

•	Poor terminal-to-wiring connections

•	Physical damage to the wiring harness

Important: Zero the J 39200 test leads before making any resistance measurements.

Step

Action

Value(s)

Yes

Was the Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - ABS

Turn the ignition switch to the OFF position.
Disconnect the 24-way EBCM connector.
Disconnect the instrument panel harness connector C1.
Turn the ignition switch to the ON position.

Do not start the engine.

Use the J 39200 in order to measure the voltage between the 24-way EBCM harness connector C1 terminal B5 and ground.

Is the voltage within the specified range?

0.0-1.0 V

Go to Step 3

Go to Step 11

Turn the ignition switch to the OFF position.
Reconnect the instrument panel harness connector.
Use a fused jumper (such as a J 36169-A ) with a 3A fuse in order to connect the 24-way EBCM connector C1 terminal B5 to ground.
Turn the ignition switch to the ON position.

Do not start the engine.

Is the red BRAKE warning indicator on?

Go to Step 4

Go to Step 9

Inspect the master cylinder brake fluid level.

Is the brake master cylinder fluid full?

Go to Step 5

Go to Step 18

Turn the ignition switch to the OFF position.
Remove the fused jumper.
Apply parking Brake.
Turn the ignition switch to the ON position.

Do not start the engine.

Use the J 39200 in order to measure the voltage between the 24-way EBCM harness connector C1 terminal B5 and ground.

Is the voltage within the specified range?

0.0-2.0 V

Go to Step 6

Go to Step 19

Release the park brake.
Turn the ignition switch to the OFF position.
Disconnect the brake fluid level indicator sensor connector.
Inspect the 24-way EBCM connector C1 terminal B5 for the following conditions:

•	Poor terminal contact

•	Terminal corrosion

•	Terminal damage

Inspect the brake fluid level indicator sensor connector for the following conditions:

•	Poor terminal contact

•	Terminal corrosion

•	Terminal damage

Is there poor terminal contact, terminal corrosion, or terminal damage?

Go to Step 20

Go to Step 7

Reconnect the 24-way EBCM connector C1.
Start the engine.
Use the scan tool in order to inspect for DTCs.

Does DTC C1287 set as a current DTC?

Go to Step 26

Go to Step 8

Turn the ignition switch to the OFF position.
Reconnect the brake fluid level indicator sensor connector.
Start the engine.
Allow the engine to run for at least 10 seconds.
Use the scan tool in order to inspect for DTCs.

Does DTC C1287 set as a current DTC?

Go to Step 21

Go to Step 27

Turn the ignition switch to the OFF position.
Remove the instrument panel cluster. Refer to Instrument Cluster Replacement .

Is the red BRAKE warning indicator lamp open?

Go to Instrument Cluster System Check in Instrument Panel, Gauges for diagnosis

Go to Step 10

Use the J 39200 in order to measure the resistance between the instrument panel cluster connector C1 terminal C7 and the 24-way EBCM connector C1 terminal B5.

Is the resistance within the specified range?

0.0-2.0 ohms

Go to Instrument Cluster System Check in Instrument Panel, Gauges for diagnosis

Go to Step 25

Turn the ignition switch to the OFF position.
Reconnect the instrument panel harness connector C1.
Turn the ignition switch to the ON position.

Do not start the engine.

Observe the red BRAKE warning indicator.

Is the red BRAKE warning indicator on?

Go to Step 12

Go to Step 14

Install the scan tool in order to inspect for DTCs.

Is DTC C1286 set as either a current and/or history DTC?

Go to DTC C1286 EBCM Turned On Brake Warning Indicator

Go to Step 13

Release the park brake.
Disconnect the park brake indicator switch connector.
Use the J 39200 in order to measure the resistance between the park brake indicator switch terminal A and ground.

Is the resistance within the specified range?

(Infinite)

Go to Step 27

Go to Step 22

Reconnect the 24-way EBCM connector C1.
Install a scan tool.
Select Special Functions on the scan tool.
Select the Lamp Test on the scan tool.
Use the scan tool in order to command the red BRAKE warning indicator on.

Is the red BRAKE warning indicator on?

Go to Step 27

Go to Step 15

Turn the ignition switch to the OFF position
Remove the fuse block Cluster Fuse (10A).
Disconnect the 24-way EBCM connector C1.
Turn the ignition switch to the ON position. Do not start the engine.
Use J 39200 in order to measure the voltage between the 24-way EBCM connector C1 terminal C7 and ground.

Is the voltage within the specified range?

0.0-1.0 V

Go to Step 16

Go to Step 23

Turn the ignition switch to the OFF position.
Inspect CKT 33 and the 24-way EBCM connector C1 for damage.

Damage may result in a short to voltage with the 24-way EBCM connector C1 connected.

Is there any damage to CKT 33 or the 24-way EBCM connector C1 which may cause a short to voltage?

Go to Step 24

Go to Step 17

Reconnect the 24-way EBCM connector C1.
Turn the ignition switch to the ON position.
Verify that the engine is off.
Use the scan tool in order to inspect for DTCs.

Does DTC C1287 set as a current DTC?

Go to Step 26

Go to Step 27

Fill the brake master cylinder with approved brake fluid such as SUPREME 11 (GM Brand) or equivalent DOT 3 brake fluid.

Is the brake master cylinder full?

Go to Step 5

Repair the open or the high resistance in the park brake wiring. Refer to Brake Warning System.

Is the repair complete?

Go to Diagnostic System Check - ABS

Replace all the terminals or the connectors that exhibit any of the following conditions:

•	Poor terminal contact

•	Terminal corrosion

•	Damaged terminals

Is the repair complete?

Go to Diagnostic System Check - ABS

Repair the open or the high resistance in the master cylinder brake fluid level indicator sensor.

Is the repair complete?

Go to Diagnostic System Check - ABS

Replace the park brake indicator switch. Refer to Parking Brake Indicator Switch Replacement in Parking Brake.

Is the repair complete?

Go to Diagnostic System Check - ABS

Repair the short to voltage in CKT 39 or CKT 33.

Is the repair complete?

Go to Diagnostic System Check - ABS

Repair the damage to CKT 33 or the 24-way EBCM connector C1. The damage may cause a short to voltage.

Is the repair complete?

Go to Diagnostic System Check - ABS

Repair the open or the high resistance in CKT 33 between the following components:

•	The instrument panel cluster connector C2 terminal C7

•	The 24-way EBCM connector C1 terminal C7

Is the repair complete?

Go to Diagnostic System Check - ABS

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

Is the repair complete?

Go to Diagnostic System Check - ABS

Is the malfunction intermittent or is not present at this time?

Go to Diagnostic Aids