Pinpoint Test 6: The Heated Seats Are Inoperative

PINPOINT TEST 6: THE HEATED SEATS ARE INOPERATIVE

WARNING:Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.

WARNING:Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

CAUTION:Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test.See - Seats - Principles Of Operation or - Symptom Related Diagnostic Procedures for direction to the appropriate Pinpoint Test.

Normal Operation

The HVAC module contains the heated seat control buttons and indicators. The heated seat system functions independently from the climate control system. A heated seat relay is located underneath each heated seat cushion frame. There are 2 voltage supplies to the heated seat relay. Voltage is supplied from the Smart Junction Box (SJB) heated seat relay enable circuit (GY) to each heated seat relay coil when the engine is running. Ground is supplied to the opposite side of the driver or passenger relay coil by HVAC module driver heated seat relay drive circuit (W/L) or passenger heated seat relay drive circuit (GY/Y) when a heated seat switch button is pressed to energize the affected relay. This closes the relay contact to supply battery voltage from SJB circuit (Y/R) to the driver heater mat circuit (V/G) or passenger heater mat circuit (Y/G). The driver and passenger heater mats are directly connected to ground circuit (B/GY) completing the electrical circuit to heat the seats.

Possible Causes
- Fuse(s)
- Wiring, terminals or connectors
- HVAC module

Diagnostic Procedure

NOTE:The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON.
NOTE:The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

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