Front Heated Seat Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Driver Heated Seat Element Control Terminal 3 X2
|
B242A 02
|
B2425 0D
|
B242A 01
|
B2425 0B, B2425 0E
|
Driver Heated Seat Element Control Terminal 1 X2
|
B242A 02
|
B2425 0D
|
B242A 01
|
B2425 0B, B2425 0E
|
Driver Heated Seat Cushion Temperature Sensor Signal
|
B1925 02
|
B1925 05
|
B1925 05
|
B2345 13
|
Driver Heated Seat Cushion Temperature Sensor Low Reference
|
-
|
B1925 05
|
-
|
B2345 13
|
Passenger Heated Seat Element Control Terminal 5 X2
|
B242A 02
|
B2430 0D
|
B242A 01
|
B2430 0B, B2430 0E
|
Passenger Heated Seat Element Control Terminal 2 X2
|
B242A 02
|
B2430 0D
|
B242A 01
|
B2430 0B, B2430 0E
|
Passenger Heated Seat Cushion Temperature Sensor Signal
|
B2170 02
|
B2170 05
|
B2170 05
|
B2345 13
|
Passenger Heated Seat Cushion Temperature Sensor Low Reference
|
-
|
B2170 05
|
-
|
B2345 13
|
|
| |
Circuit/System Description
The driver and passenger heated seats are controlled by separate
heated seat switches that are located in the HVAC control. When a
heated seat switch is pressed, a serial data message is sent from
the HVAC control to the HVAC control module indicating the heated
seat command. The HVAC control module then serves as a gateway to
transmit the message to the seat heating control module via the
serial data line. In response to this message, the seat heating
control module applies battery positive voltage through the element
supply voltage circuit to the appropriate seat heating elements.
The seat heating control module then sends a serial data message
back to the HVAC control module to gateway the information to the
HVAC control to either illuminate or turn off the appropriate
temperature indicator.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Heated Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Engine ON, observe the scan
tool Driver Seat Heating/Venting/Cooling Mode parameter while
pressing the driver HEATED seat switch. The reading should change
between Off and Back & Cushion Heat. |
| ⇒ |
If not the specified value, replace the A26 HVAC
control. |
| 2. |
Observe the scan tool
Passenger Seat Heating/Venting/Cooling Mode parameter while
pressing the passenger HEATED seat switch. The reading should
change between Off and Back & Cushion Heat. |
| ⇒ |
If not the specified value, replace the A26 HVAC
control. |
| 3. |
If all scan tool parameter
readings are normal, there are no DTCs set, and the driver and/or
passenger heated seat is inoperative, replace the K29 seat heating
control module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
|
