C107C–BRAKE PEDAL SWITCH 1/2 STUCK





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    When the vehicle is driven.

  • Set Condition:

    If the Anti-Lock Brakes Module detects an implausible signal from the Stop Lamp Switch.


Possible Causes
 
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
 
MISADJUSTED PEDAL SWITCH
 
(B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT (GAS) SHORTED TO GROUND
 
(B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT (GAS) OPEN
 
STOP LAMP SWITCH
 
ANTI-LOCK BRAKES MODULE
 




Diagnostic Test

1.VERIFY DTC IS ACTIVE

NOTE: Diagnose and repair all Pressure Sensor and Voltage related DTCs and all Stop Lamp related DTCs and symptoms before diagnosing this DTC.







WARNING: Ensure brake capability is available before road testing.






Does this DTC reset?

Yes
  • Go To 2


No
  • 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)

2.INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORS





Were any problems found?

Yes


No
  • Go To 3

3.CHECK (B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT (GAS) FUNCTION WHILE DEPRESSING & RELEASING THE BRAKE PEDAL








Does the test light illumination toggle from off to on?

Yes
  • Go To 7


No
  • Go To 4

4.CHECK (B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT (GAS) FOR A SHORT TO GROUND







Is the resistance below 5.0 ohms?

Yes
  • 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).


No
  • Go To 5

5.CHECK (B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT (GAS) FOR AN OPEN





Is the resistance below 5.0 ohms?

Yes
  • Go To 6


No

6.CHECK (B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT (GAS) FOR A OPEN GROUND


Is the resistance below 5 ohms?

Yes


No
  • Repair the open in the (Z904) Ground circuit.

7.CHECK BRAKE PEDAL ADJUSTMENT
  • Reconnect the Stop Lamp Switch harness connector.




Does the test light illumination toggle from off to on within 4–5 mm of brake pedal travel?

Yes


No