Pinpoint Test A: No Communication With The Generic Electronic Module (Gem)

WARNING: This page is about a different car, the 2004 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK CIRCUIT 29-DK20 (OG/GN) AND CIRCUIT 29-AA17 (OG/WH) FOR VOLTAGE

Key in OFF position.
Disconnect: GEM C201c.
Key in ON position.
Measure the voltage between GEM C201 c pin 5, circuit 29-DK20 (OG/GN), harness side and ground and GEM C201 c pin 1, circuit 29-AA17 (OG/WH), harness side and ground.

Fig 1: Checking Circuit 29-DK20 (OG/GN) And Circuit 29-AA17 (OG/WH) For Voltage
Courtesy of FORD MOTOR CO.
Is the voltage greater than 10 volts?

Yes

GO to A2.

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

A2 CHECK GEM CIRCUIT 31-DK20 (BK) FOR OPEN

Key in OFF position.
Disconnect: GEM C201a.
Measure the resistance between GEM C201 a pin 5, circuit 31-DK20 (BK), harness side and ground.

Fig 2: Checking GEM Circuit 31-DK20 (BK) For Open
Courtesy of FORD MOTOR CO.
Is the resistance less than 5 ohms?

Yes

GO to A3.

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A3 CHECK GEM CIRCUIT 91-DK20 (BK/RD) FOR OPEN

Measure the resistance between GEM C201 d pin 1, circuit 91-DK20 (BK/RD), harness side and ground.

Fig 3: Checking GEM Circuit 91-DK20 (BK/RD) For Open
Courtesy of FORD MOTOR CO.
Is the resistance less than 5 ohms?

Yes

REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnosis.

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.