No Response From CCN

NO RESPONSE FROM CCN





For complete wiring diagram refer to the wiring section.

POSSIBLE CAUSES
- (A924) (A920) (AH 7) fused B(+) circuits open or shorted
- (Z946) (Z948) ground circuits open
- (F21) (F983) fused ignition switch output circuit open or shorted
- (D55) and (D54) CAN B bus circuits open
- cluster (CCN)

DIAGNOSTIC TEST

1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

NOTE:
- Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts. With the scan tool, select ECU view.
- A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

Q: Does the scan tool display a red X next to the module?

YES: Go To 2
NO: The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent , pushed out, and corroded terminals.




2. (A924) (A920) (AH 7) FUSED B(+) CIRCUITS OPEN OR SHORTED
Turn the ignition off.
Disconnect the Cluster harness connectors.
Using a 12-volt test light connected to ground, check each (A924) (A920) (AH 7) Fused B(+) circuit.

Q: Does the test light illuminate brightly for each circuit?

YES: Go To 3
NO: Repair the (A924) (A920) (AH 7) Fused B(+) circuit for an open or short. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




3. (Z946) (Z948) GROUND CIRCUITS OPEN
Using a 12-volt test light connected to 12-volts, check each (Z946) (Z948) ground circuit.

Q: Does the test light illuminate brightly for each circuit?

YES: Go To 4
NO: Repair the (Z946) (Z948) ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




4. (F21) (F983) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED

Turn the ignition on.
Using a 12-volt test light connected to ground, check each (F21) (F983) Fused Ignition Switch Output circuit.

Q: Does the test light illuminate brightly for each circuit?

YES: Go To 5
NO: Repair the (F21) (F983) Fused Ignition Switch Output circuit for an open or short. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




5. (D55) AND (D54) CAN B BUS CIRCUITS OPEN

NOTE: One open circuit will not cause this condition.

Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.
Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.

Q: Is there any voltage present on either circuit?

YES: Replace the Cluster in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test