Diagnostic Test

Turn the ignition on.

With the scan tool, record and erase DTCs.

Press the Memory Set Switch several time in all positions.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read DTCs.

Does the scan tool display: B1D4C MEMORY SWITCH INPUT 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 Memory Switch Input

Courtesy of DAIMLERCHRYSLER CORP.

With the scan tool, erase DTCs.

Turn the ignition off.

Disconnect the Driver Window/Door Lock Switch C2 connector.

Cycle the ignition 3 times.

Turn the ignition on.

With the scan tool, read DTCs.

Does the scan tool display: B1D4C MEMORY SWITCH INPUT CIRCUIT HIGH? 

Yes 

1. Go To  3).

No 

1. Replace the Driver Window/Door Lock Switch in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .

Fig 2: Checking Right/Left Door Lock Switch MUX Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Driver Door Module C2 connector.

Turn the ignition on.

Measure the voltage of the (G160/G161) Right/Left Door Lock Switch MUX circuit.

Is the voltage above 0.2 volts? 

Yes 

1. Repair the (G160/G161) Right/Left Door Lock Switch MUX circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1 .

No 

1. Go To  4).

Fig 3: Checking Memory Switch MUX Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Driver Door Module C3 connector.

Turn the ignition on.

Measure the voltage of the (P439) Memory Select Switch MUX circuit.

Is the voltage above 0.2 volts? 

Yes 

1. Repair the (P439) Memory Select Switch MUX circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1 .

No 

1. Replace the Driver Door Module in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .