Diagnostic Test

1) CHECK COMMUNICATION WITH OTHER MODULES

Fig 1: Connecting Scan Tool & Turning Ignition On
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Using the DRB III®, attempt to communicate with the PCM.

Is the DRB III® able to communicate with the PCM?

Yes
1. Go to step 2).
No
1. Perform Symptom *No Response From All Modules.
2) CHECK COMMUNICATION WITH OTHER MODULES ON SCI TRANSMIT CIRCUIT

Fig 2: Connecting Scan Tool & Turning Ignition On
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition on.

Using the DRB III®, attempt to communicate with either the Instrument Cluster, A/C Heater Control Module, or Universal Garage Door Opener/Tire Pressure Monitor.

Is the DRB III® able to communicate with the module selected?

Yes
1. Go to step 3).
No
1. Go to step 6).
3) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

Fig 3: Checking Fused Ignition Switch Output Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Power Top Control Module harness connector.

NOTE: Check connector - Clean/repair as necessary.

Turn the ignition on.

Measure the voltage of the Fused Ignition Switch Output circuit at the Power Top Control Module harness connector.

Is the voltage above 10 volts?

Yes
1. Go to step 4).
No
1. Repair the Fused Ignition Switch Output circuit for an open.
2. Perform BODY VERIFICATION TEST .
4) GROUND CIRCUIT OPEN

Fig 4: Checking Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance of the Ground circuit from the Power Top Control Module harness connector to ground.

Is the resistance below 5.0 ohms?

Yes
1. Go to step 5).
No
1. Repair the Ground circuit for an open.
2. Perform BODY VERIFICATION TEST .
5) SCI TRANSMIT CIRCUIT OPEN

Fig 5: Checking SCI Transmit Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance of the SCI Transmit circuit from the Power Top Control Module harness connector to the DLC.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Power Top Control Module.
2. Perform BODY VERIFICATION TEST .
No
1. Repair the SCI Transmit circuit for an open.
2. Perform BODY VERIFICATION TEST .
6) SCI TRANSMIT CIRCUIT SHORTED TO GROUND OR OPEN

Fig 6: Checking SCI Transmit Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance between ground and the SCI Transmit circuit.

Is the resistance above 100 kohms?

Yes
1. Repair the SCI Transmit circuit for an open.
2. Perform BODY VERIFICATION TEST .
No
1. Repair the SCI Transmit circuit for a short to ground.
2. Perform BODY VERIFICATION TEST .