GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Intrigue 🢒 Brakes 🢒 Antilock Brake System - Delco VI 🢒 DTC C1294 Brake Lamp Switch Circuit Always Active

Object Number: 247754 Size: MF
ABS Components
Antilock Brake System Schematics
Handling Electrostatic Discharge Sensitive Parts Notice
OBDII Symbol Description Notice
Power Distribution Schematics
Exterior Lights Schematics

Circuit Description

DTC C1294 determines the proper operation of the brake switch. Proper operation of the brake switch is important because ABS is activated and ETS is inhibited when the brake switch is on. The brake switch deactivates the ABS when the brake switch is off. The following conditions always occur when the brake switch is on:

    • ABS operation is always requested.
    • ETS operation is inhibited.

Conditions for Setting the DTC

DTC C1294 can set if the vehicle's speed is greater than 40 km/h (25 mph).

A malfunction exists if the brake was always on during two consecutive drive cycles.

Action Taken When the DTC Sets
    • A malfunction DTC stores.
    • ABS operation remains.
    • ETS operation is inhibited.

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

If the malfunction is not current, use wiggle test on the wiring harness to pinpoint an intermittent malfunction in the motor circuitry or connections. Thoroughly inspect any circuitry that may be causing 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
    • Rubbed-through wire insulation
    • A broken wire inside the insulation

The following conditions may cause an intermittent malfunction:

    • A poor connection
    • Rubbed-through wire insulation
    • A broken wire inside the insulation

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2
  1. Turn the ignition switch to the OFF position.
  2. Verify that there is no pressure on the brake pedal.
  3. Observe the rear brake lamps.

Are the rear brake lamps on?

--

Go to Step 3

Go to Step 5

3

Disconnect the stoplamp switch connector C1.

Are the rear brake lamps on?

--

Go to Step 8

Go to Step 4

4

Inspect the adjustment of the stoplamp switch.

Is the stoplamp switch adjusted correctly?

--

Go to Step 10

Go to Step 9

5
  1. Disconnect the 24-way EBTCM connector C1.
  2. Turn the ignition switch to the ON position.

    3. Do not start the engine.

  3. Use the J 39200 in order to measure the voltage between the 24-way EBTCM connector C1 terminal B9 and ground.

Is the voltage within the specified range?

0-2 V

Go to Step 6

Go to Step 8

6
  1. Turn the ignition switch to the OFF position.
  2. Inspect the 24-way EBTCM connector C1 and the 24-way EBTCM harness connector C1 for the following conditions:
    3. • Terminal damage
    • Poor terminal contact
    • Terminal corrosion

Is there evidence of poor terminal contact, terminal corrosion, or damaged terminals?

--

Go to Step 11

Go to Step 7

7
  1. Reconnect the 24-way EBTCM connector C1.
  2. Install a scan tool.
  3. Turn the ignition switch to the ON position.

    4. Do not start the engine.

  4. Start the engine.
  5. Test drive the vehicle obtaining a speed at least 40 km/h (25 mph).
  6. Repeat the drive cycle, and steps 3,4, and 5 at least two additional times.
  7. Use the scan tool in order to inspect for DTCs.

Does DTC C1294 set as a current DTC during the last three drive cycles?

--

Go to Step 12

Go to Step 13

8

Repair the short to voltage in CKT 17.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

9

Adjust the stoplamp switch. Refer to Stop Lamp Switch Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

10

Replace the stoplamp switch. Refer to Stop Lamp Switch Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

11

Replace all of the terminals and connectors that exhibit the following conditions:

    • Poor terminal contact
    • Corrosion
    • Damaged terminals

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

12

Replace the EBTCM. Refer to Electronic Brake and Traction Control Module Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

13

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

--

Go to Diagnostic Aids

--