B10B4

B10B4-CABIN HEATER 1 CONTROL CIRCUIT LOW

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the ignition on, the Cabin Heater Relay energized.

- Set Condition:
If the Totally Integrated Power Module (TIPM) detects that the (K360) Cabin Heater 1 Relay Control circuit is shorted to ground.





1. VERIFY THAT THE DTC IS ACTIVE

WARNING: When the engine is operating, do not stand in direct line with the fan, do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

1. Turn the ignition on.
2. With the scan tool, erase the DTCs.
3. With the scan tool, actuate the Cabin Heater Relay.
4. Monitor the scan tool for at least two minutes.
5. With the scan tool, read the DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded or contaminated terminals. Repair as necessary.

2. CHECK (K360) CABIN HEATER 1 RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the TIPM C1 harness connector.
3. Remove the Cabin Heater Relay.
4. Measure the resistance between ground and the (K360) Cabin Heater 1 Relay Control circuit in the TIPM C1 harness connector.

Does the Ohm meter read open circuit?

Yes

- Repair the (K360) Cabin Heater 1 Relay Control circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK (K360) CABIN HEATER 1 RELAY CONTROL CIRCUIT FOR AN OPEN
1. Measure the resistance of the (K360) Cabin Heater 1 Relay Control circuit between the Cabin Heater Relay connector and the TIPM C1 harness connector.

Does the Ohm meter read open circuit?

Yes

- Repair the (K360) Cabin Heater 1 Relay Control circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK PTC NO. 1 RELAY
1. Install the TIPM harness connectors.
2. Install a substitute PTC No. 1 Relay in place of the vehicle's PTC No. 1 Relay.
3. Turn the ignition on.
4. With the scan tool, erase the TIPM DTCs.
5. With the scan tool, actuate the PTC No. 1 Relay.
6. Monitor the scan tool for at least two minutes.
7. With the scan tool, read Totally Integrated Power Module (TIPM) DTCs.

Is the status Active for this DTC?

Yes

- Go To 5

No

- Replace the PTC No. 1 Relay.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. INSPECT RELATED WIRING AND CHECK FOR TSBs
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the PTC No. 1 Relay and the TIPM.
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 (TSBs) that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Totally Integrated Power Module (TIPM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.