Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR A DTC C107D-BRAKE PEDAL SWITCH 1/2 CORRELATION
NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.

With the scan tool, read and record DTC's.

With the scan tool, read and record Freeze Fame information.

With the scan tool, erase DTC's.

Cycle the ignition switch from off to on.

With the scan tool, read and record DTC's.

Does the scan tool display: C107D-BRAKE PEDAL SWITCH 1/2 CORRELATION?

Yes
1. Go To step 2).
No
1. Refer ABS-INTERMITTENT CONDITION .
2. Perform ABS VERIFICATION TEST - VER 1 .
2) CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE
Check all related wiring for bruised, chafed, pierced, or partially broken wires.

Check all related connectors for broken, bent, pushed out, or corroded terminals.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) CHECK THE (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT WHILE DEPRESSING AND RELEASING BRAKE PEDAL

Fig 1: Checking Brake Pedal Switch 1 Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

NOTE: The voltmeter must be connected to 12 volts to perform this test.

Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Turn the ignition on.

Measure the voltage of the (B15) Brake Switch No. 1 Signal circuit.

Depress and release the brake pedal.

Does the voltage change?

Yes
1. Replace the Anti-lock Brake Module in accordance with the Service Information.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Go To step 4).
4) CHECK THE (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT FOR AN OPEN

Fig 2: Checking Brake Pedal Switch 1 Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Stop Lamp Switch harness connector.

Measure the resistance of the (B15) Brake Switch No. 1 Signal circuit.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Stop Lamp Switch in accordance with the Service Information.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Repair the (B15) Brake Switch No. 1 Signal circuit for an open.
2. Perform ABS VERIFICATION TEST - VER 1 .