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Pinpoint Test AC: A Single Climate Controlled Seat is Inoperative - Switch Indicators May or May Not Illuminate




Seats

Pinpoint Tests

Pinpoint Test AC: A Single Climate Controlled Seat is Inoperative - Switch Indicators May or May Not Illuminate

Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number

Normal Operation

Both the driver and front passenger climate controlled seats are independently controlled electronically by the Dual Climate Controlled Seat Module (DCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a scan tool to command the DCSM, diagnostic testing can be carried out with the ignition switch ON and the engine OFF. The system receives voltage from Battery Junction Box (BJB) fuse 16 (30A) supplying battery voltage on circuit SBB16 (VT/RD) into DCSM C3036a pins E and F. If voltage is disconnected from either pin E or F of DCSM C3036a with the connection remaining on the other circuit, both seats will remain operational because the circuits are connected internally in the DCSM. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the DCSM and the other will remain operational.

Each driver and front passenger seat cushion and backrest are equipped with a Thermo-Electric Device (TED) assembly that includes a seat blower (fan motor, serviced as an assembly with the TED). Cabin air is drawn through the blower and distributed to each of the TED modules located in the seat cushion and backrest. The TEDs then heat or cool the air. The air is then directed into the foam pad and manifold where it is distributed along the surface of the cushion and backrest of the seat. Once the system is activated, the DCSM uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the HVAC module seat switch settings.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Medium Speed Controller Area Network (MS-CAN) fault
- HVAC module
- DCSM



PINPOINT TEST AC: A SINGLE CLIMATE CONTROLLED SEAT IS INOPERATIVE - SWITCH INDICATORS MAY OR MAY NOT ILLUMINATE

NOTICE: When taking measurements at Dual Climate Controlled Seat Module (DCSM) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.

NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition 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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AC1 CHECK 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 AC2.

No
If both seats are inoperative, GO to Symptom Chart. Symptom Related Diagnostic Procedures

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AC2 CHECK FOR DCSM AND HVAC DTCs


- Enter the following diagnostic mode on the scan tool: Self Test - DCSM.
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC module.
- Were any DTCs retrieved during the self-tests?

Yes
For DCSM DTCs, GO to the Dual Climate Controlled Seat Module (DCSM) DTC Chart. Dual Climate Controlled Seat Module (DCSM) DTC Chart

For HVAC DTCs, REFER to Heating and Air Conditioning to diagnose the HVAC module fault.

No
GO to AC3.

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AC3 CHECK OPERATION OF THE DCSM USING PIDs


NOTE: The purpose of this step is to verify the DCSM is able to receive and process inbound command messages from the communication bus and demonstrate if the DCSM 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.
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 Thermal Electric Device (TED) Temperature (PCSHTMP)
- Passenger Back TED Temperature (PBKTMP)
- Passenger TED Heat Mode (TED_HEAT_P)
- NOTE: The DCSM active commands TED_HEAT_D (driver seat) and TED_HEAT_P (passenger seat) are limited to 15 seconds in the ON state.
- 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 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 fan movement.
- Do the PID states or cushion blower movement indicate climate controlled seat operation when using the active command?

Yes
GO to AC4.

No
INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) Dual Climate Controlled Seat Module (DCSM). REPEAT the self-test. CLEAR the DTCs.

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AC4 USE THE HVAC SWITCH AND MONITOR THE DCSM PID FOR A RESPONSE


- Enter the following diagnostic mode on the scan tool: DataLogger - DCSM.
- 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 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 on the HVAC while monitoring the DCSM PID DCCSMOD (driver seat) or PCCSMOD (passenger seat).
- Do all the PID states match the climate controlled seat settings selected on the HVAC module?

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 connector pins. REPEAT the self-test. CLEAR the DTCs.

No
INSTALL a new HVAC module. REPEAT the self-test. CLEAR the DTCs.

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