C107D–BRAKE PEDAL SWITCH 1/2 CORRELATION

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

  With the ignition on, but not during first run.

  Or, with low supply voltage.

  Or, if a Pressure Sensor fault is active.

• Set Condition:

  If the Anti-Lock Brakes Module detects a mismatch between the Brake Test Signal (BTS) from the Pressure Sensor and the (B15) Secondary Brake Switch Signal circuit (Diesel) or the (B15) Brake Switch No. 1 Signal circuit (Gas).

Diagnostic Test

NOTE: Diagnose and repair all Pressure Sensor, Voltage related, Stop Lamp related and U1503-Implausible Message Data Length Received from FCM DTCs and symptoms before diagnosing this DTC.

• Go To 2

• The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
• Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)

• Repair as necessary.
• Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

• Go To 3

• Replace the Stop Lamp Switch in accordance with the Service Information.
• Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

• Go To 4

• Go To 5

• Repair the (B15) Secondary Brake Switch Signal circuit (Diesel) or the (B15) Brake Switch No. 1 Signal circuit (Gas) for an open.
• Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

• Repair the (B15) Secondary Brake Switch Signal circuit (Diesel) or the (B15) Brake Switch No. 1 Signal circuit (Gas) for a short to ground.
• Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

• Go To 6

• Replace the Stop Lamp Switch in accordance with the Service Information.
• Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

• Repair the open in the (Z940) Ground circuit.