U1000-CAN B BUS (+) CIRCUIT- DDM - PDM

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition in the run position.
Set Condition:
If the Driver/Passenger Door Module senses that the (D55) Can B Bus (+) circuit is either open, or shorted to voltage, or shorted to ground.

Possible Causes

FOR THE DRIVER MEMORY MIRROR SYSTEM:

ACTIVE CAN B BUS DTCs IN FRONT CONTROL MODULE (FCM)

(D55) CAN B BUS (+) CIRCUIT OPEN TO DRIVER DOOR MODULE

DRIVER DOOR MODULE

FOR THE PASSENGER MEMORY MIRROR SYSTEM:

ACTIVE CAN B BUS DTCs IN FRONT CONTROL MODULE (FCM)

(D55) CAN B BUS (+) CIRCUIT OPEN TO PASSENGER DOOR MODULE

PASSENGER DOOR MODULE

NOTE: Since this DTC can set in the Driver Door Module (DDM) and in the Passenger Door Module (PDM) this procedure addresses both systems' circuits and components. Select only that which applies to the system you are diagnosing.

Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTCs.

Does the scan tool display: U1000 CAN B BUS (+) CIRCUIT?

Yes

Go To 2

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.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

2. CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)

With the scan tool, read Front Control Module (FCM) DTCs

Does the scan tool display any active CAN B BUS related DTCs?

Yes

Diagnose and repair the DTC(s). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING).

Go To 3

3. CHECK THE (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN BETWEEN THE FRONT CONTROL MODULE & THE DRIVER / PASSENGER DOOR MODULE

For the Driver Memory Mirror System, proceed as follows:

Turn the ignition off.
Disconnect the Driver Door Module C2 connector.
Disconnect the Front Control Module C1 connector.
Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 connector and the Driver Door Module C2 connector.

For the Passenger Memory Mirror System, proceed as follows:

Turn the ignition off.
Disconnect the Passenger Door Module C2 connector.
Disconnect the Front Control Module C1 connector.
Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 connector and the Passenger Door Module C2 connector.

Is the resistance below 2.0 ohms?

Yes, Driver Mirror

Replace the Driver Door Module in accordance with the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Yes, Passenger Mirror

Replace the Passenger Door Module in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Repair the (D55) Can B Bus (+) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).