• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+, CCSM Terminal D X1 | 1 | 1 | -- | -- |
Ignition Voltage, CCSM Terminal 15 X2 | 1 | 1 | -- | -- |
Heated/Cooled Seat Mode Signal, CCSM Terminal 15 X2 | 1 | 1 | 1 | -- |
Seat Blower Voltage Reference | 1 | 1 | -- | -- |
Seat Blower Tachometer Signal | 1 | 1 | 1 | -- |
Seat Blower Speed Control | 1 | 1 | 1* | -- |
Seat Blower Low Reference | -- | 1 | -- | -- |
Seat Back Temperature Sensor Signal | 1 | 1 | 1* | -- |
Seat Back Temperature Sensor Low Reference | -- | 1 | -- | -- |
Seat Back Heated/Cool Ventilation Module Cool Control | 1 | 1 | -- | -- |
Seat Back Heated/Cool Ventilation Module Heat Control | 1 | 1 | -- | -- |
Seat Cushion Temperature Sensor Signal | 1 | 1 | 1* | -- |
Seat Cushion Temperature Sensor Low Reference | -- | 1 | -- | -- |
Seat Cushion Heated/Cool Ventilation Module Cool Control | 1 | 1 | -- | -- |
Seat Cushion Heated/Cool Ventilation Module Heat Control | 1 | 1 | -- | -- |
Ground - CCSM | -- | 1 | -- | -- |
* A short B+ will damage the component 1. Heated and cooled seat is inoperative |
Battery positive voltage is supplied at all times to the climate control seat modules (CCSM) through the HTD SEAT LH 15A fuse for the driver seat and the HTD SEAT RH 15A fuse for the passenger seat that are located in the IP fuse block. This voltage is used by each module to supply power to the ventilation modules and the blower motor. Each CCSM is also supplied with ignition voltage through the RPA/H/C SEAT/WPR RELAYS 10A fuse located in the body control module (BCM). This voltage is used to power up each module and allows the climate control seat (CCS) system to operate only with the ignition in the ON position. Each CCSM is grounded through the module ground circuit.
• | In order to perform valid tests when diagnosing the climate control seat system, the ignition must be cycled OFF then ON between each test in order to reset the climate control seat module. |
• | A short to ground in the heated/cool ventilation module HEAT control circuit will open the HTDST fuse when the heat mode is selected, and the heat mode will be inoperative. However, when the COOL mode is selected, the system will operate normally. |
• | A short to ground in the heated/cool ventilation module COOL control circuit will open the HTDST fuse when the cool mode is selected and the system will be inoperative. However, when the HEAT mode is selected, the system operate normally. |
Heated/Cooled Seats Description and Operation
Control Module References for scan tool information
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
⇒ | If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module. |
⇒ | If the voltage did not change state, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module. |
⇒ | If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, test or replace the seat cushion heated/cooled ventilation module. |
⇒ | If less than the specified range, test for a short between the control circuits. If the circuits test normal, test or replace the seat cushion heated/cooled ventilation module. |
⇒ | If not the specified value, test the signal circuit for a short to ground. |
⇒ | If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the seat cushion heated/cooled ventilation module. |
⇒ | If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, test or replace the seat cushion heated/cooled ventilation module. |
⇒ | If greater than the specified value, test the control circuits for an open/high resistance. If the circuits test normal, test or replace the seat back heated/cooled ventilation module. |
⇒ | If less than the specified range, test for a short between the control circuits. If the circuits test normal, test or replace the seat back heated/cooled ventilation module. |
⇒ | If not the specified value, test the signal circuit for a short to ground. |
⇒ | If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, test or replace the seat back heated/cooled ventilation module. |
⇒ | If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, test or replace the seat back heated/cooled ventilation module. |
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
⇒ | If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM. |
⇒ | If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the CCSM. |
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
⇒ | If not the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CCSM. |
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
⇒ | If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the CCSM. |
Important: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for CCSM and HVAC control module replacement, setup, and programming |