B10B9-CABIN HEATER 2 CONTROL CIRCUIT HIGH (FCM)

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on and the PTC No. 2 Relay command on.
Set Condition:
If the Front Control Module (FCM) detects that the (K361) PTC No. 2 Relay Control circuit voltage is shorted to voltage.

Possible Causes

(K361) PTC NO. 2 RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE

(K361) PTC NO. 2 RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

PTC NO. 2 RELAY

FRONT CONTROL MODULE (FCM)

Diagnostic Test

1. VERIFY THAT THE DTC IS ACTIVE

WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.

NOTE: If the FCM detects and stores a DTC, the FCM also stores the environmental conditions under which the DTC was set.

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

Turn the ignition on.
With the scan tool, erase FCM DTCs.
With the scan tool, actuate the PTC No. 2 Relay.
Monitor the scan tool for at least two minutes.
With the scan tool, read FCM DTCs.

Is the status Active for this DTC?

Yes

Go To 2

Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.

2. CHECK PTC NO. 2 RELAY

With the scan tool, erase FCM DTCs.
Turn the ignition off.
Remove the PTC No. 2 Relay.
Turn the ignition on.
With the scan tool, actuate the PTC No. 2 Relay.
With the scan tool, read FCM DTCs.

NOTE: The scan tool should display an open circuit DTC with the PTC No. 2 Relay removed.

Does the scan tool display: B10B9–CABIN HEATER 2 CONTROL CIRCUIT HIGH?

Yes

Go To 3

Replace the PTC No. 2 Relay in accordance with the Service Information.
Perform the BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

3. CHECK (K361) PTC NO. 2 RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

Turn the ignition off.
Disconnect the FCM from the Power Module.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.
Turn the ignition on.
Measure the voltage of the (K361) PTC No. 2 Relay Control circuit in the PTC No. 2 Relay connector.

Is there any voltage present?

Yes

Repair the (K361) PTC No. 2 Relay Control circuit for a short to voltage.

Perform the BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 4

4. CHECK (K361) PTC NO. 2 RELAY CONTROL FOR AN OPEN OR HIGH RESISTANCE

Turn the ignition off.
Measure the resistance of the (K361) PTC No. 2 Relay Control circuit between the PTC No. 2 Relay connector and the Front Control Module (FCM) connector.

Is the resistance below 10.0 ohms?

Yes

Go To 5

Repair the (K361) PTC No. 2 Relay Control circuit for an open or high resistance.
Perform the BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the PTC No. 2 Relay and the FCM.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

Repair as necessary.

Perform the BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Replace the FCM in accordance with the Service Information.
Perform the BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).