A - No Communication With Driver Seat Module (DSM)

Pinpoint Test A - No Communication With Driver Seat Module (DSM)

A1 - Check Power Supply To Driver Seat Module

- Disconnect driver seat module connector C2.
- Using a voltmeter, measure for voltage at driver seat module connector pin C2-12, circuit 296 (W/P) Town Car or circuit 785 (BK/LG) Crown Victoria, Grand Marquis.

Is voltage B+?

YES GO to A4.
NO GO to A2.

A2 - Check Circuit 296 (W/P) Town Car Or Circuit 785 (BK/LG) Crown Victoria, Grand Marquis For Short To Ground

- Remove fuse 8 (15A) from fuse junction panel.
- Using an ohmmeter connected to ground, measure resistance at driver seat module pin C2-12, circuit 296 (W/P) Town Car or circuit 785 (BK/LG) Crown Victoria, Grand Marquis.

Is resistance less than 10K ohms?

YES SERVICE circuit 296 (W/P) Town Car or circuit 785 (BK/LG) Crown Victoria, Grand Marquis for short to ground. REPLACE Fuse 8 (15A). RESTORE vehicle. RETEST system.
NO GO to A3.

A3 - Check Fuse 8 (15A)

- Using an ohmmeter, measure resistance between terminals of fuse 8 (15A).

Is resistance 5 ohms or less?

YES SERVICE circuit 296 (W/P) Town Car or circuit 1785 (BK/LG) Crown Victoria, Grand Marquis for open. RESTORE vehicle. RETEST system.
NO REPLACE fuse 8 (15A). RESTORE vehicle. RETEST system.

A4 - Check Circuit 676 (PK/O) Town Car Or Circuit 57 (BK) Crown Victoria, Grand Marquis For Open

- Using an ohmmeter connected to ground, measure resistance at driver seat module pin C2-11, circuit 676 (PK/O) Town Car or circuit 57 (BK) Crown Victoria, Grand Marquis.

Is resistance less than 5 ohms?

YES GO to Information Bus to diagnose network concern. Information Bus
NO SERVICE circuit 676 (PK/O) Town Car or circuit 57 (BK) Crown Victoria, Grand Marquis for open. RESTORE vehicle. RETEST system.