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 ACTIVE DTC
With the scan tool, read the active DTC's.

Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.

With the scan tool, read the active DTC's.

Does the scan tool display this DTC as active?

Yes
1. Go To step 2).
No
1. If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2) LEFT REMOTE RADIO SWITCH

Fig 1: Left Remote Radio Switch
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Left Remote Radio Switch harness connector.

Turn the ignition on.

With the scan tool monitor the Remote Radio Control Switch voltage.

Is the voltage approximately 5.0 volts?

Yes
1. Replace the Left Remote Radio Switch in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) RIGHT REMOTE RADIO SWITCH

Fig 2: Right Remote Radio Switch
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Right Remote Radio Switch harness connector.

Turn the ignition on.

With the scan tool monitor the Remote Radio Control Switch voltage.

Is the voltage approximately 5.0 volts?

Yes
1. Replace the Right Remote Radio Switch in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 4).
4) CLOCKSPRING

Fig 3: Clockspring
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Clockspring C1 harness connector.

Turn the ignition on.

With the scan tool monitor the Remote Radio Control Switch voltage.

Is the voltage approximately 5.0 volts?

Yes
1. Check the (X20) Radio Control MUX circuit for a short between the clockspring and the remote radio switches. If OK, replace the Clockspring in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 5).
5) (X20) RADIO CONTROL MUX CIRCUIT SHORT TO GROUND

Fig 4: Radio Control MUX Circuit Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Instrument Cluster C1 harness connector.

Measure the resistance between ground and the (X20) Radio Control MUX circuit.

Is the resistance below 100.0 ohms?

Yes
1. Repair the (X20) Radio Control MUX circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 6).
6) (X20) RADIO CONTROL MUX CIRCUIT SHORT TO (G902) SWITCH MUX RETURN CIRCUIT

Fig 5: Radio Control MUX Circuit Short To Switch MUX Return Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Instrument Cluster C2 harness connector.

Measure the resistance between the (X20) Radio Control MUX circuit and the (G902) Switch MUX Return circuit.

Is the resistance below 100.0 ohms?

Yes
1. Repair the (X20) Radio Control MUX circuit for a short to the (G902) Switch MUX Return circuit.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Instrument Cluster (CCN) in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .