Diagnostic Test

WARNING: This page is about a different car, the 2008 Jeep Commander. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

With the scan tool, select ECU view.

NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

Does the scan tool display a red X next to the module?

Yes
1. Go To step 2.
No
1. The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
(A108) FUSED B(+) CIRCUIT OPEN OR SHORTED

Fig 1: Checking (A108) Fused B(+) Circuit For Open Or Short
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Cluster C2 harness connector.

Using a 12-volt test light connected to ground, check the (A108) Fused B(+) circuit.

Does the test light illuminate brightly?

Yes
1. Go To step 3.
No
1. Repair the (A108) Fused B(+) circuit for an open or short.
2. Perform BODY VERIFICATION TEST .
(Z905) (Z18) GROUND CIRCUITS OPEN

Fig 2: Checking Each (Z905)/(Z18) Ground Circuit
Courtesy of CHRYSLER LLC

Using a 12-volt test light connected to 12-volts, check each (Z905) (Z18) ground circuit.

Does the test light illuminate brightly for each circuit?

Yes
1. Go To step 4.
No
1. Repair the (Z905) (Z18) ground circuit for an open.
2. Perform BODY VERIFICATION TEST .
(F941) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED

Fig 3: Checking (F941) Fused Ignition Switch Output Circuit For Open Or Short
Courtesy of CHRYSLER LLC

Turn the ignition on.

Using a 12-volt test light connected to ground, check the (F941) Fused Ignition Switch Output circuit.

Does the test light illuminate brightly?

Yes
1. Go To step 5.
No
1. Repair the (F941) Fused Ignition Switch Output circuit for an open or short.
2. Perform BODY VERIFICATION TEST .
(D55) AND (D54) CAN B BUS CIRCUITS OPEN

Fig 4: Measuring Voltage Between (D54)/(D55) CAN B Bus (-)/(+) Circuit And Ground
Courtesy of CHRYSLER LLC

NOTE: One open circuit will not cause this condition.

Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.

Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.

Is there any voltage present on either circuit?

Yes
1. Replace the Cluster in accordance with the service information.
2. Perform BODY VERIFICATION TEST .
No
1. Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage.
2. Perform BODY VERIFICATION TEST .