Diagnostic Test

With the scan tool, record and erase DTC's

Cycle the ignition from on to off.

Turn the ignition on.

With the scan tool, read DTC's.

Does the scan tool display: B2123-IGNITION RUN CONTROL CIRCUIT HIGH? 

Yes 

1. Go To  2).

No 

1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. Perform BODY VERIFICATION TEST - VER 1 .

Fig 1: Checking Ignition Run Relay

Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Cluster C2 connector.

Momentarily connect a jumper wire between the (F102) Ignition Run Relay Control circuit and the (Z905) Ground circuit in the Cluster C2 connector.

Did the relay actuate? 

Yes  

1. Replace the Instrument Cluster in accordance with Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .

No  

1. Go To  3).

Fig 2: Checking Ignition Run Relay Control Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Junction Block C2 connector (on top of junction block).

Measure the voltage between ground and the (F102) Ignition Run Relay Control circuit in the Cluster C2 connector.

Turn the ignition on.

Is there any voltage present? 

Yes 

1. Repair the (F102) Ignition Run Relay Control circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1 .

No 

1. Replace the Junction Block in accordance with Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .