Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE CABIN HEATER 1 RELAY
1. Turn the ignition off.
2. Remove the Cabin Heater 1 Relay and substitute it with a known good relay.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 3
  No
  - Replace the Cabin Heater 1 Relay in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K360) PTC 1 RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Remove the Cabin Heater 1 Relay.
3. Disconnect the BCM D harness connector.
4. Measure the resistance between ground and the (K360) PTC 1 Relay Control circuit.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the short to ground in the (K360) PTC 1 Relay Control circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K360) PTC 1 RELAY CONTROL CIRCUIT FOR AN OPEN
1. Measure the resistance of the (K360) PTC 1 Relay Control circuit between the Cabin Heater 1 Relay harness connector and the BCM D harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (K360) PTC 1 Relay Control circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
INSPECT RELATED WIRING AND CHECK FOR TSB'S
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Cabin Heater 1 Relay and the BCM.
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals.
5. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the BCM in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .