Pinpoint Test D: The Heated Seat Does Not Operate Correctly - Driver Or Passenger Seat Heats When the System is Off

Seats

Pinpoint Test D: The Heated Seat Does Not Operate Correctly - Driver or Passenger Seat Heats When the System is Off

Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information Electrical Diagrams.

Normal Operation

The heated seat system only operates when the engine is running. When the driver or passenger heated seat switch (located on the instrument panel) is activated, it supplies a ground signal to the Body Control Module (BCM). When the BCM (Body Control Module) receives the heated seat switch signal, it activates the appropriate (driver or passenger) heated seat relay (located in the Central Junction Box (CJB)). When the heated seat relay is activated, voltage is supplied to the cushion heater mat. The cushion heater mats are directly connected to ground to complete the electrical circuit to heat the seat.

- DTC B1034:14 (Left Front Seat Heater Element: Circuit Short To Ground or Open)- if the driver heated seat relay drive circuit CHS02 (YE/BU) is open or shorted to ground and the BCM (Body Control Module) attempts to activate the driver heated seat relay, this DTC sets and the seat fails to heat (circuit open) or may be on at all times (circuit shorted to ground) until the ignition is turned OFF.

- DTC B1036:14 (Right Front Seat Heater Element: Circuit Short To Ground or Open)- if the passenger heated seat relay drive circuit CHS07 (GY/BU) is open or shorted to ground and the BCM (Body Control Module) attempts to activate the passenger heated seat relay, this DTC sets and the seat fails to heat (circuit open) or may be on at all times (circuit shorted to ground) until the ignition is turned OFF.

This pinpoint test is intended to diagnose the following:

- Heated seat relay

- Wiring, terminals or connectors

- BCM (Body Control Module)

PINPOINT TEST D : THE HEATED SEAT DOES NOT OPERATE CORRECTLY - DRIVER OR PASSENGER SEAT HEATS WHEN THE SYSTEM IS OFF

NOTE: If a seat equipped with a seat mounted side air bag is being serviced, depower the Supplemental Restraint System (SRS). Refer to Restraints and Safety Systems &/or Air Bag Systems.

NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS (Supplemental Restraint System) fault.

NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.

D1 CHECK THE AFFECTED HEATED SEAT OPERATION WITH THE RELAY REMOVED

- Ignition OFF.

- Disconnect: Driver or Passenger Heated Seat Relay.

- Ignition ON.

- Observe the affected driver or passenger heated seat switch.

Is the affected driver or passenger heated seat switch indicator illuminated?

Yes
REPAIR circuit CHS11 (VT/GN) (driver seat) or CHS12 (YE/GN) (passenger seat) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
GO to D2.

D2 CHECK THE RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280D.

- For driver heated seat, measure the resistance between driver heated seat relay socket pin 2, circuit CHS02 (YE/BU), harness side and ground.





- For passenger heated seat, measure the resistance between passenger heated seat relay socket pin 2, circuit CHS07 (GY/BU), harness side and ground.





Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new driver heated seat relay or passenger heated seat relay. RECONNECT all connectors. TEST the system for normal operation. If the concern is still present, GO to D3.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

D3 CHECK THE BCM (Body Control Module) FOR CORRECT OPERATION

- Disconnect all of the BCM (Body Control Module) connectors.

- Check for:
- corrosion.

- pushed-out pins.


- Connect all of the BCM (Body Control Module) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.