*CAN C BUS COMMUNICATION FAILURE

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
The scan tool cannot communicate with ANY module on the CAN C Bus circuit.

Possible Causes

(D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE

(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE

(D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND

(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND

(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT

ANTILOCK BRAKE MODULE

POWERTRAIN CONTROL MODULE (PCM or ECM)

STEERING ANGLE SENSOR

BODY CONTROL MODULE

Diagnostic Test

1.VERIFY CAN C BUS COMMUNICATION

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

NOTE: A red X will be next to the module that is not communicating or not installed on the vehicle, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

Does the scan tool communicate with any module on the CAN C Bus circuit?

Yes

The conditions that caused this symptom are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

Go To 2

2.CHECK THE D65 CAN C (+) AND (D64) CAN C (-) CIRCUITS FOR A SHORT TO VOLTAGE

Is the voltage steadily above 4.0 volts?

Yes

Go To 3

Go To 4

3.(D65) CAN C BUS (+) CIRCUIT OR (D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE

NOTE: Perform the following steps for each module on the CAN C Bus Circuit.

Is there any voltage present with all modules disconnected?

Yes

Repair the (D65) CAN C Bus (+) circuit or (D64) CAN C Bus (-) circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Replace the module in accordance with the service information that when disconnected eliminated the short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

4.CHECK THE (D65) CAN C BUS (+) CIRCUIT AND THE (D64) CAN C BUS (-) CIRCUIT FOR A SHORT TO GROUND

Is the resistance below 5.0 ohms on either circuit?

Yes

Go To 5

Go To 6

5.(D65) CAN C BUS (+) CIRCUIT OR (D64) CAN C (-) CIRCUIT SHORTED TO GROUND

NOTE: Perform the following steps for each module on the CAN C Bus Circuit.

Is the resistance below 5.0 ohms with all modules disconnected?

Yes

Repair the (D65) CAN C Bus (+) circuit or (D64) CAN C Bus (-) circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Replace the module in accordance with the service information that when disconnected eliminated the short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

6.(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT

NOTE: Perform the following steps for each module on the CAN C Bus Circuit.

Is the resistance below 5.0 ohms with all modules disconnected?

Yes

Repair the (D65) CAN C Bus (+) circuit for a short to the (D64) CAN C Bus (-) circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Replace the module in accordance with the service information that when disconnected eliminated the short.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)