Diagnostic Test

1) ACTIVE DTC
NOTE: Make sure the Stop Lamp Switch is properly adjusted before continuing.

NOTE: Make sure the Stop Lamp Switch is properly wired, such as (B15) Brake Switch No. 1 and (B16) Brake Switch No. 2 Signal circuit are not switched at the harness connector.

Ignition on, engine not running.

With a scan tool, select View DTCs.

Press and release the Brake Pedal.

Is the DTC Active at this time?

Yes
1. Go to 2).
No
1. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
2) (B15) BRAKE SWITCH NO. 1 SIGNAL SHORTED TO GROUND

Fig 1: Checking Brake Switch No. 1 Signal Circuit Shorted To Ground
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Stop Lamp Switch harness connector.

Disconnect the C3 PCM harness connector.

Measure the resistance between ground and the (B15) Brake Switch No. 1 Signal circuit in the Stop Lamp Switch harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (B15) Brake Switch No. 1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 3).
3) (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT OPEN

Fig 2: Checking Brake Switch No. 2 Signal Circuit For Open
Courtesy of CHRYSLER LLC

Disconnect the C3 PCM harness connector.

Measure the resistance of the (B16) Brake Switch No. 2 Signal circuit from the Stop Lamp Switch harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go to 4).
No
1. Repair the open in the (B16) Brake Switch No. 2 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
4) (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 3: Checking Speed Control Supply/Brake Switch No. 2 Signal Circuit Short To Ground
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (B16) Brake Switch No. 2 Signal circuit in the Stop Lamp Switch harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (B16) Brake Switch No. 2 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 5).
5) (Z904) GROUND CIRCUIT OPEN

Fig 4: Checking Ground Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (Z904) Ground circuit in the Stop Lamp Switch harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to 6).
No
1. Repair the open in the (Z904) Ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
6) STOP LAMP SWITCH
Measure the resistance between the (Z904) Ground circuit terminal and the (B15) Brake Switch No. 1 Signal terminal in the Stop Lamp Switch.

Next, measure the resistance between the (F942) Fused Ignition Switch Output circuit terminal and the (B16) Brake Switch No. 2 Signal circuit terminal in the Stop Lamp Switch.

Apply and release the Stop Lamp Switch while monitoring the ohmmeter.

Does the resistance change from below 5.0 ohms to an open circuit for one or both of the measurements taken?

Yes
1. Go to 7).
No
1. Replace the Stop Lamp Switch.
2. Perform POWERTRAIN VERIFICATION TEST .
7) PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .