Pinpoint Test M: The Heated Seats Are Inoperative - Driver And Front Passenger
Seats
Pinpoint Tests
Pinpoint Test M: The Heated Seats are Inoperative - Driver and Front Passenger
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The heated seat module receives ignition voltage feed on circuit CBP35 (YE/GY), battery voltage feed on circuit SBB22 (BN/RD) and is supplied ground on circuit GD148 (BK/YE). When voltage is supplied and the driver heated seat button on the HVAC module is pressed, a momentary ground signal is sent to the heated seat module to command the system on or off. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is high, low, off, high, etc.). The heated seat module is designed to remain on, heating the seat and maintaining temperature until switched off or a 10-minute time-out period occurs.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Backrest or cushion heater mat
- Heated seat module
- HVAC module
PINPOINT TEST M: THE HEATED SEATS ARE INOPERATIVE - DRIVER AND FRONT PASSENGER
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.
-------------------------------------------------
M1 CHECK VOLTAGE TO THE HEATED SEAT MODULE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures of Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C3227.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.
- Disconnect: Heated Seat Module C3304.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
- Connect the battery ground cable.
- Ignition ON.
- Measure the voltage between:
- heated seat module C3304-2, circuit CBP35 (YE/GY), harness side and ground.
- heated seat module C3304-1, circuit SBB22 (BN/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to M2.
No
VERIFY Battery Junction Box (BJB) fuse 22 (20A) and Smart Junction Box (SJB) fuse 35 (10A) are OK. If OK, REPAIR the affected circuit. TEST the system for normal operation.
If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C3227.
CONNECT passenger seat safety belt buckle pretensioner C3066.
REPOWER the SRS. REFER to Air Bag Systems.
-------------------------------------------------
M2 CHECK THE HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between heated seat module C3304-7, circuit GD148 (BK/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to M3.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C3227.
CONNECT passenger seat safety belt buckle pretensioner C3066.
REPOWER the SRS. REFER to Air Bag Systems.
-------------------------------------------------
M3 CHECK THE TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN
- Disconnect: Passenger Heated Seat Cushion C334.
- Measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and passenger seat cushion heater mat C334-3, circuit RHS05 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Front Heated Seat Module - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C3227.
CONNECT passenger seat safety belt buckle pretensioner C3066.
REPOWER the SRS. REFER to Air Bag Systems.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable.
CONNECT driver seat side air bag C3226 and passenger seat side air bag module C3227.
CONNECT driver seat safety belt buckle pretensioner C3065 and passenger seat safety belt buckle pretensioner C3066.
REPOWER the SRS. REFER to Air Bag Systems.
-------------------------------------------------