Diagnostic Test

1) CHECK FOR AN ACTIVE DTC
Turn the ignition on.

With the scan tool, record and erase DTCs.

Wait 30 seconds.

With the scan tool, read DTCs.

Is the DTC active?

Yes
1. Go To 2).
No
1. The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) CHECK VOLTAGE AT COMPASS MODULE

Fig 1: Checking Fused Run Relay Output Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Compass Module harness connector.

Turn the ignition on.

Check the voltage of the (F921) Fused Run Relay Output circuit.

Is the voltage above 10 volts?

Yes
1. Go To 3).
No
1. Repair the (F921) Fused Run Relay Output circuit for an open.
  Perform BODY VERIFICATION TEST - VER 1 .
3) CHECK GROUND CIRCUIT

Fig 2: Checking Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance between ground and the (Z915) Ground circuit.

Is the resistance above 10K ohms?

Yes
1. Repair the (Z915) Ground circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To 4).
4) CHECK LIN BUS CIRCUIT FOR AN OPEN

Fig 3: Checking LIN BUS Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Cluster C1 harness connector.

Measure the resistance of the (D500) LIN Bus circuit.

Is the resistance below 10K ohms?

Yes
1. Replace the Cluster in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Repair the (D500) LIN Bus circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .