Diagnostic Test

1) TEST FOR AN INTERMITTENT CONDITION
NOTE: Troubleshoot any Ignition, Battery, or Cluster DTCs before proceeding.

Turn the ignition on.

Using the scan tool, record and erase DTCs.

Turn the ignition off, wait 10 seconds then turn the ignition on.

Using the scan tool, read DTCs.

Does the scan tool display: B2107-IGNITION SWITCH SENSE INPUT CIRCUIT/PERFORMANCE?

Yes
1. Go To step 2).
No
1. The condition that caused this code to set is not present at this time. Using the wiring diagram as a guide, inspect the wiring and connectors for an intermittent condition. Operate the system several times and recheck for active DTCs.
2. Perform BODY VERIFICATION TEST - VER 1. Refer to BODY VERIFICATION TEST - VER 1 .
2) CHECK IGNITION SWITCH OPERATION

Fig 1: Measuring Voltage Of Ignition Switch Sense Circuits
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Ignition Switch harness connector.

Measure the voltage of the G20 and G900 Ignition Switch Sense circuits at the Ignition Switch harness connector.

Is the voltage above 4.4 volts?

Yes
1. Replace the Ignition Switch in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1. Refer to BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) (G900) IGNITION SWITCH SENSE RETURN CIRCUIT SHORT TO GROUND

Fig 2: Measuring Resistance Between Ground & Ignition Switch Sense Return Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Ignition Switch harness connector.

Disconnect the Instrument Cluster C2 harness connector.

Measure the resistance between ground and the (G900) Ignition Switch Sense Return circuit.

Is the resistance below 10K ohms?

Yes
1. Repair the (G900) Ignition Switch Sense Return circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1. Refer to BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 4).
4) (G900) IGNITION SWITCH SENSE RETURN CIRCUIT OPEN

Fig 3: Measuring Resistance Of Ignition Switch Sense Return Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the (G900) Ignition Switch Sense Return circuit.

Is the resistance above 10K ohms?

Yes
1. Repair the (G900) Ignition Switch Sense Return circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. Refer to BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 5).
5) (G20) IGNITION SWITCH SENSE SIGNAL CIRCUIT SHORT TO GROUND

Fig 4: Measuring Resistance Between Ground & Ignition Switch Sense Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Ignition Switch harness connector.

Disconnect the Instrument Cluster C2 harness connector.

Measure the resistance between ground and the (G20) Ignition Switch Sense Signal circuit.

Is the resistance below 10K ohms?

Yes
1. Repair the (G20) Ignition Switch Sense Signal circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1. Refer to BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 6).
6) (G20) IGNITION SWITCH SENSE SIGNAL CIRCUIT OPEN

Fig 5: Measuring Resistance Of Ignition Switch Sense Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the (G20) Ignition Switch Sense Signal circuit.

Is the resistance above 10K ohms?

Yes
1. Repair the (G20) Ignition Switch Sense Signal circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. Refer to BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Instrument Cluster in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1. Refer to BODY VERIFICATION TEST - VER 1 .