Pinpoint Test B: DTC B1483

Anti-Lock Control

Pinpoint Tests

Pinpoint Test B: DTC B1483

Refer to Wiring Diagrams Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number

Normal Operation

The ABS module receives brake pedal input from the PCM over the High Speed Controller Area Network (HS-CAN) bus. The ABS module compares this information against other inputs (wheel speed signals, vehicle speed signal, brake pressure transducer) to determine if the brake pedal input is valid.

- DTC B1483 (Brake Pedal Input Circuit Failure) - If, during normal operation or the on-demand self test, the ABS module cannot detect the brake pedal input or if the brake pedal input does not match information from other sensors (wheel speed signals, vehicle speed signal, brake pressure transducer), DTC B1483 will be set.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Brake pedal switch



PINPOINT TEST B: DTC B1483

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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B1 CHECK THE STOPLAMPS FOR CORRECT OPERATION


- Check the stoplamps for correct operation by pressing and releasing the brake pedal and observing the stoplamps.
- Do the stoplamps operate correctly?

Yes
GO to B2.

No
REFER to Brake Lamp for further diagnosis of the stoplamps. Testing and Inspection

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B2 CHECK THE SPEED CONTROL SYSTEM FOR CORRECT OPERATION


- Drive the vehicle and verify that the speed control is deactivated when the brake pedal is pressed.
- Does the speed control deactivate when the brake pedal is pressed?

Yes
GO to B3.

No
REFER to Cruise Control for further diagnosis of the speed control system.

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B3 CHECK THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID


- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
- Monitor the BOO_ABS PID while pressing and releasing the brake pedal.
- Does the PID display match the brake pedal position?

Yes
The concern is not present at this time. CLEAR the DTCs. REPEAT the self-test.

No
REFER to Information Bus to diagnose the HS-CAN bus.

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