Pinpoint Test M: A Single Climate Controlled Seat is Inoperative - Switch Indicators May Or May Not Illuminate
Seats
Pinpoint Test M: A Single Climate Controlled Seat is Inoperative - Switch Indicators May Or May Not Illuminate
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) is supplied voltage at all times, but the climate controlled seat system only operates with the engine running. The system can be operated with the ignition ON engine OFF by using a scan tool to bypass the climate controlled seat switches on the HVAC module and when commanding a heat or cool mode operation in this manner will only operate in 15-second intervals. Both voltage supply circuits are spliced together internal to the DCSM (Dual Climate Controlled Seat Module), so if one circuit becomes open, both seats can still be operated. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the DCSM (Dual Climate Controlled Seat Module).
The DCSM (Dual Climate Controlled Seat Module) receives all control commands over the Controller Area Network (CAN) communication circuits from the HVAC module which contains the climate controlled seat switches. The climate controlled seat system can only operate if both the HVAC module and DCSM (Dual Climate Controlled Seat Module) are communicating correctly on the CAN (Controller Area Network) circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- HVAC module
- DCSM (Dual Climate Controlled Seat Module)
PINPOINT TEST M : A SINGLE CLIMATE CONTROLLED SEAT IS INOPERATIVE - SWITCH INDICATORS MAY OR MAY NOT ILLUMINATE
M1 CHECK THE OPERATION OF BOTH CLIMATE CONTROLLED SEATS AND VERIFY THE SYMPTOM
- Check the operation of both climate controlled seats and verify the symptom.
Is only a single climate controlled seat inoperative?
Yes
GO to M2.
No
If both seats are inoperative, GO to Symptom Chart. Symptom Related Diagnostic Procedures
M2 CHECK FOR DCSM (Dual Climate Controlled Seat Module) AND HVAC MODULE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test- DCSM (Dual Climate Controlled Seat Module).
- Enter the following diagnostic mode on the scan tool: Self Test- HVAC module.
Were any DTCs retrieved during the self-tests?
Yes
For DCSM (Dual Climate Controlled Seat Module) DTCs, GO to the Dual Climate Controlled Seat Module (DCSM) DTC Chart. Seats
For HVAC module DTCs, REFER to Heating and Air Conditioning to diagnose the HVAC module fault.
No
GO to M3.
M3 CHECK OPERATION OF THE DCSM (Dual Climate Controlled Seat Module) USING PIDs
NOTE: The purpose of this step is to verify the DCSM (Dual Climate Controlled Seat Module) is able to receive and process inbound command messages from the communication bus and demonstrate if the DCSM (Dual Climate Controlled Seat Module) is operational. This indicates the HVAC module may not be sending the commands correctly.
- Enter the following diagnostic mode on the scan tool: DataLogger- DCSM (Dual Climate Controlled Seat Module). Driver Seat
- Seat cushion thermal electric device temperature (CSHTEMP)
- Seat back thermal electric device temperature (BK_TEMP)
- Climate-controlled seat heat command (TED_HEAT_D)
Front Passenger Seat
- Passenger Cushion Thermo-Electric Device (TED) Temperature (PCSHTMP)
- Passenger Back TED (Thermo-Electric Device) Temperature (PBKTMP)
- Passenger TED (Thermo-Electric Device) Heat Mode (TED_HEAT_P)
- NOTE: The DCSM (Dual Climate Controlled Seat Module) active commands TED_HEAT_D (driver seat) and TED_HEAT_P (passenger seat) are limited to 15 seconds in the ON state, then turn OFF.
Operate the affected climate controlled seat using the active command while monitoring the appropriate PIDs for that seat.
- When the command is in process the TED (Thermo-Electric Device) temperature PIDs on the affected seat should momentarily increase. If no temperature increase is noted, remove the cushion blower filter and repeat the active command while physically monitoring the cushion blower for movement.
Do the PID states or cushion blower movement indicate climate controlled seat operation when using the active command?
Yes
GO to M4.
No
GO to M5.
M4 USE THE CLIMATE CONTROLLED SEAT SWITCH AND MONITOR THE DCSM (Dual Climate Controlled Seat Module) PID FOR A RESPONSE
- Enter the following diagnostic mode on the scan tool: DataLogger- DCSM (Dual Climate Controlled Seat Module).
- Driver State Seat Mode (DCCSMOD) (driver seat)
- Passenger State Seat Mode (PCCSMOD) (passenger seat)
- Start the engine.
- NOTE: Operation of the climate controlled seats repeatedly ON and OFF or repeatedly switching between heat and cool modes may cause DCSM (Dual Climate Controlled Seat Module) DTCs to set, disabling one or both seat system and may require DTCs to be cleared before seat operation may continue. It is recommended to allow time between modes for seat temperatures to return toward ambient temperatures before continuing.
Attempt to operate the affected climate controlled seat in all modes using the appropriate switch while monitoring the DCSM (Dual Climate Controlled Seat Module) PID DCCSMOD (driver seat) or PCCSMOD (passenger seat).
Do all the PID states match the climate controlled seat settings selected?
Yes
If the fault is intermittent, CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the fault by flexing the wire harness and operating the system. CHECK the electrical connectors for corrosion, poor pin contact or pushed-out pins. REPAIR any intermittent concerns found and TIGHTEN any loose DCSM (Dual Climate Controlled Seat Module) connector pins. CLEAR the DTCs. REPEAT the self-test.
No
INSTALL a new HVAC module. CLEAR the DTCs. TEST the system for normal operation.
M5 CHECK FOR CORRECT DCSM (Dual Climate Controlled Seat Module) OPERATION
NOTE: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. 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.
- Ignition OFF.
- 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.
For vehicles equipped with seat side air bags, carry out the following:
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraints and Safety Systems &/or Air Bag Systems.
- Disconnect the passenger seat side air bag module C339.
- Connect the battery ground cable.
- Disconnect all the DCSM (Dual Climate Controlled Seat Module) electrical connectors.
- Check the harness and component side connectors for the following:
- corrosion.
- damaged pins.
- pushed-out pins.
- Connect all the DCSM (Dual Climate Controlled Seat Module) electrical connectors and make sure they seat correctly.
- Start the engine.
- Operate the climate controlled seats and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new DCSM (Dual Climate Controlled Seat Module). REFER to Dual Climate Controlled Seat Module (DCSM) . CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test.
For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test.
For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.