Pinpoint Test B: No Communication With The Driver Door Module (DDM)

WARNING: This page is about a different car, the 2005 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK CIRCUITS 1524 (DB) and 1213 (WH/LB) FOR VOLTAGE

Key in OFF position.
Disconnect: DDM C501a and C501c.
Key in ON position.

Measure the voltage between the DDM, harness side and ground using the following chart:

DDM CONNECTOR-PIN SPECIFICATION

DDM Connector-Pin	Circuit
C501a-2	1213 (WH/LB)
C501a-21	1524 (DB)
C501c-3 (if equipped with power striker only)	1213 (WH/LB)

Fig 1: Measuring Voltage Between DDM, Harness Side And Ground

Courtesy of FORD MOTOR CO.

Are the voltages greater than 10 volts?

Yes : GO to B2.
No : REPAIR the circuit in question. REPEAT the self-test.

B2 CHECK CIRCUITS 57 (BK) AND 676 (PK/OG) FOR AN OPEN
- Measure the resistance between DDM C501a pin 1, circuit 57 (BK), harness side and ground; and between DDM C501a pin 5, circuit 676 (PK/OG), harness side and ground.
  
  Fig 2: Measuring Resistance Between DDM C501a Pin 1, Circuit 57 (BK), Harness Side And Ground; And Between DDM C501a Pin 5, Circuit 676 (PK/OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : Refer to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communication network.
- No : REPAIR the circuit(s) in question. REPEAT the self-test.