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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Monte Carlo 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C1287 Brake Warning Indicator Circuit Open or Shorted to Voltage

Object Number: 215295 Size: SF

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 controlling 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 DTC(s) 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 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 3 and CKT 39.

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

    • Backed out terminals
    • Improper mating
    • Broken locks
    • 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. Refer to the J 39200 user's manual.

DTC C1287 Brn Warn Indicator CKT Open/Short to V

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check

2
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the 24-way EBCM connector C1.
  3. Disconnect the instrument panel harness connector C1.
  4. Turn the ignition switch to the RUN position.

    5. Do not start the engine.

  5. 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

3
  1. Turn the ignition switch to the OFF position.
  2. Reconnect the instrument panel harness connector C1.
  3. Use a fused jumper with a 3A fuse in order to connect the 24-way EBCM connector C1 terminal B5 to ground.
  4. Turn the ignition switch to the RUN position.

    5. Do not start the engine.

Is the red BRAKE warning indicator on?

--

Go to Step 4

Go to Step 9

4

Inspect the master cylinder brake fluid level.

Is the brake master cylinder fluid full?

--

Go to Step 5

Go to Step 18

5
  1. Turn the ignition switch to the OFF position.
  2. Remove the fused jumper.
  3. Turn the ignition switch to the RUN position.

    4. Do not start the engine.

  4. 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

6
  1. Release the park brake.
  2. Turn the ignition switch to the OFF position.
  3. Disconnect the brake fluid level indicator sensor connector.
  4. Inspect the 24-way EBCM connector C1 terminal B5 for the following conditions:
    5. • Poor terminal contact
    • Terminal corrosion
    • Terminal damage
  5. Inspect the brake fluid level indicator sensor connector for the following conditions:
    6. • 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

7
  1. Reconnect the 24-way EBCM connector C1.
  2. Start the engine.
  3. Use the Scan Tool in order to inspect for DTCs.

Does DTC C1287 set as a current DTC?

--

Go to Step 27

Go to Step 8

8
  1. Turn the ignition switch to the OFF position.
  2. Reconnect the brake fluid level indicator sensor connector.
  3. Start the engine.
  4. Allow the engine to run for at least 10 seconds.
  5. 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 28

9
  1. Turn the ignition switch to the OFF position.
  2. Remove the instrument panel cluster.
  3. Remove the red BRAKE warning indicator lamp.
  4. Inspect the red BRAKE warning indicator lamp.

Is the red BRAKE warning indicator lamp open?

--

Go to Step 22

Go to Step 10

10

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

Is the resistance within the specified range?

0.0-2.0 ohms

Refer to Instrument Cluster System Check in Instrument Cluster, Gauges, and Console.

Go to Step 26

11
  1. Turn the ignition switch to the OFF position.
  2. Reconnect the instrument panel harness connector C1.
  3. Turn the ignition switch to the RUN position.

    4. Do not start the engine.

  4. Observe the red BRAKE warning indicator.

Is the red BRAKE warning indicator on?

--

Go to Step 12

Go to Step 14

12

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

13
  1. Release the park brake.
  2. Disconnect the park brake indicator switch connector.
  3. 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?

OL

(Infinite)

Go to Step 28

Go to Step 23

14
  1. Reconnect the 24-way EBCM connector C1.
  2. Install a Scan Tool .
  3. Select Special Functions on the Scan Tool .
  4. Select the Lamp Test on the Scan Tool .
  5. Use the Scan Tool in order to command the red BRAKE warning indicator on.

Is the red BRAKE warning indicator on?

--

Go to Step 28

Go to Step 15

15
  1. Turn the ignition switch to the OFF position
  2. Remove the fuse block Fuse 39 (10A).
  3. Disconnect the 24-way EBCM connector C1.
  4. Turn the ignition switch to the RUN position.

    5. Do not start the engine.

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

Is the voltage within the specified range?

0.0-1.0 V

Go to Step 16

Go to Step 24

16
  1. Turn the ignition switch to the OFF position.
  2. Inspect CKT 33 and the 24-way EBCM connector C1 for damage.

    3. 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 25

Go to Step 17

17
  1. Reconnect the 24-way EBCM connector C1.
  2. Turn the ignition switch to the RUN position.

    3. Do not start the engine.

  3. Use the Scan Tool in order to inspect for DTCs.

Does DTC C1287 set as a current DTC?

--

Go to Step 27

Go to Step 28

18

Fill the brake master cylinder with approved brake fluid such as SUPREME 11 (GM part number 12377967) or equivalent DOT 3 brake fluid.

Is the brake master cylinder full?

--

Go to Step 5

--

19

Repair the open or the high resistance in the park brake wiring.

Is the repair complete?

--

Go to Diagnostic System Check

--

20

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

    • Poor terminal contact
    • Terminal corrosion
    • Damaged terminal(s)

Is the repair complete?

--

Go to Diagnostic System Check

--

21

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

--

22

Replace the red BRAKE warning indicator lamp.

Is the repair complete?

--

Go to Diagnostic System Check

--

23

Replace the park brake indicator switch.

Is the repair complete?

--

Go to Diagnostic System Check

--

24

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

Is the repair complete?

--

Go to Diagnostic System Check

--

25

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

--

26

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

    • The instrument panel cluster connector C2 terminal B
    • The 24-way EBCM connector C1 terminal B5

Is the repair complete?

--

Go to Diagnostic System Check

--

27

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

Is the repair complete?

--

Go to Diagnostic System Check

--

28

The malfunction is intermittent or is not present at this time.

Is the action complete?

--

Go to Diagnostic Aids

--