P0480-COOLING FAN 1 CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
- Set Condition:
The ECM receives a CAN Bus message from the TIPM indicating an open or shorted circuit on the Radiator Fan Relay Control circuit.
| Possible Causes |
| (A935) FUSED (B+) FEED CIRCUIT |
| (N112) RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT |
| (N201) LOW/HIGH RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT OPEN |
| (N201) LOW/HIGH RADIATOR FAN CONTROL RELAY CIRCUIT SHORT TO GROUND |
| RADIATOR FAN CONTROL RELAY |
| TOTALLY INTEGRATED POWER MODULE |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1. RADIATOR FAN CONTROL RELAY OPERATIONNOTE: When actuating the radiator fan relays, the Radiator Fan(s) may have a delay in operation and ramp up slowly.
Ignition on, engine not running.
With a scan tool, select Radiator Cooling Fan Relay 1 Control State to actuate the Radiator Fan Control Relay.
Is the Cooling Fan Relay operating?
Yes
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
- Go To 2
2. (A935) FUSED B+ CIRCUIT
Turn the ignition off.
Remove the Radiator Fan Control Relay 1.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the Radiator Fan Control Relay 1 connector.
Is the voltage above 11.0 volts?
Yes
- Go To 3
No
- Repair the open or short to ground in the (A935) Fused B+ circuit. Inspect the related fuse and repair as necessary.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
3. (N112) RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT
Disconnect the TIPM C-11 harness connector.
Turn the ignition on, engine not running.
With a scan tool, select Radiator Cooling Fan Relay 1 Control State, Toggle, to actuate the Radiator Fan Control Relay.
Using a 12–volt test light connected to battery voltage, probe the (N112) Radiator Control Relay Control circuit in the TIPM C-11 harness connector.
Does the test light illuminate and flash on and off?
Yes
- Replace the Radiator Fan Control Relay.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To 4
4. (N201) LOW/HIGH RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (N201) Low/High Radiator Fan Control Relay Control circuit between the Rad Fan Control Relay 1 connector and the TIPM C11 harness connector.
Is the resistance below 10.0 ohms?
Yes
- Go To 5
No
- Replace the PDM in accordance with the Service information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
5. (N201) LOW/HIGH RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (N201) Low/High Radiator Fan Control Relay 1 Control circuit at the TIPM C11 harness connection.
Is the resistance below 1000 ohms?
Yes
- Replace the TIPM in accordance with the Service information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace Front Control Module in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)