GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0890 03: Device Voltage Reference Output 3 Circuit Below Threshold

DTC C0890 07: Device Voltage Reference Output 3 Circuit Above Threshold

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Body Control Module (BCM) B+ Terminal 1 X4

1

1

--

--

Body Control Module (BCM) B+ Terminal 3 X4

2

2

--

--

Brake Pedal Position Sensor 5-Volt Reference

C0277 06, C0890 03

C0277 06

C0277 06

--

Brake Applied Signal

C0297 00

4

4

--

Brake Pedal Position Sensor Signal

C0277 06

C0277 06

C0277 07

C0277 09, C0277 4B

Center High Mounted Stop Lamp (CHMSL) Control

B3445 00, B3884 00

3

3

--

Left Rear Stop/Turn Lamp Control

1

1

1

--

Right Rear Stop/Turn Lamp Control

2

2

2

--

Brake Pedal Position Sensor Low Reference

--

C0277 06

1

--

Center High Mounted Stop Lamp (CHMSL) Ground

--

3

--

--

Left Rear Stop/Turn Lamp Ground

--

1

--

--

Right Rear Stop/Turn Lamp Ground

--

2

--

--

1. Stop Lamps Malfunction - Left

2. Stop Lamps Malfunction - Right

3. Center High Mounted Stop Lamp (CHMSL) Malfunction

4. Cruise Control Malfunction

Circuit/System Description

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery ltage to the stop lamps, center high mounted stop lamp (CHMSL), transmission control module (TCM), and engine control module (ECM).

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

C0890 03

This DTC will set when the BCM detects a short to ground in the brake pedal position sensor voltage reference circuit.

C0890 07

This DTC will set when the BCM detects a short to battery voltage in the brake pedal position sensor voltage reference circuits.

Actions Taken When the DTC Sets

    • The Service Vehicle Soon indicator is commanded ON.
    • If the DTC sets while the vehicle is running, the BCM will activate the brake lights when the vehicles transmission is not in the PARK position and the vehicle is not accelerating.

Conditions for Clearing the DTC

    • The condition responsible for setting the DTC no longer exists.
    • A history DTC will clear once 50 malfunction-free ignition cycles have occurred.
    • A DTC will not clear the current status until the next ignition cycle.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  2. Verify that a test lamp illuminates between the low reference circuit terminal C and B+.
  3. If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
  5. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the BCM.
    If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit test normal, replace the BCM.
  6. If all circuits test normal, replace the brake pedal position sensor.

Repair Instructions

Important: Perform the Brake Pedal Position Sensor Calibration after replacement of the brake pedal position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Brake Pedal Position Sensor Replacement
    •  Brake Pedal Position Sensor Calibration
    •  Control Module References for BCM replacement, setup, and programming