Pinpoint Test K: All Climate Controlled Seats Are Inoperative - Rear
Seats
Pinpoint Test K: All Climate Controlled Seats Are Inoperative - Rear
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The Passenger Climate Controlled Seat Module - 2 (PCSM-2) is supplied voltage from Battery Junction Box (BJB) fuse 7 (30A) to C3365A pins E and F, circuit SBB07 (WH/RD). The PCSM-2 is supplied ground from C3365A pin M, circuit GD133 (BK). Both voltage supply circuits are hot at all times but the climate controlled seat system only operates with the engine running. The system can be operated with the ignition ON by using a scan tool to bypass the climate controlled seat switches on the Rear Heating Ventilation Air Conditioning (RHVAC) 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 PCSM-2, 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 PCSM-2.
The PCSM-2 receives all control commands over the Controller Area Network (CAN) communication circuits from the RHVAC module which contains the climate controlled seat switches. The climate controlled seat system can only operate if both the RHVAC module and PCSM-2 are communicating correctly on the CAN circuits.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Medium Speed Controller Area Network (MS-CAN) fault
- RHVAC module
- PCSM-2
PINPOINT TEST K: ALL CLIMATE CONTROLLED SEATS ARE INOPERATIVE - REAR
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K1 CHECK FOR PCSM-2 AND RHVAC MODULE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - PCSM-2.
- Enter the following diagnostic mode on the scan tool: Self Test - RHVAC Module.
- Are any DTCs retrieved?
Yes
For PCSM-2 DTCs, GO to the Passenger Climate Controlled Seat Module - 2 (PCSM-2) DTC Chart. Passenger Climate Controlled Seat Module - 2 (PCSM-2) DTC Chart
For RHVAC module DTCs, REFER to Climate Control System - General Information and Diagnostics Testing and Inspection to diagnose the RHVAC module fault.
No
If either the PCSM-2 or RHVAC module does not respond to the scan tool, REFER to Module Communications Network Testing and Inspection to diagnose the concern.
If module communication is OK, CHECK the climate control system operation and REFER to Climate Control System - General Information and Diagnostics Testing and Inspection to diagnose any concerns found.
Otherwise, GO to K2.
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K2 CHECK OPERATION OF THE PCSM-2 USING PIDs
NOTE: The purpose of this step is to verify the PCSM-2 is able to receive and process inbound command messages from the communication bus and demonstrate if the PCSM-2 is operational. This indicates the RHVAC module may not be sending the commands correctly.
- Enter the following diagnostic mode on the scan tool: DataLogger - PCSM-2.
Driver Side Seat
- Seat cushion thermal electric device temperature (CSHTEMP)
- Seat back thermal electric device temperature (BK_TEMP)
- Climate-controlled seat heat command (TED_HEAT_D)
Passenger Side Seat
- Passenger Cushion Thermo-Electric Device (TED) Temperature (PCSHTMP)
- Passenger Back TED Temperature (PBKTMP)
- Passenger TED Heat Mode (TED_HEAT_P)
- NOTE: The PCSM-2 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 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
INSTALL a new RHVAC module. REFER to Auxiliary Climate Control Rear Heating Ventilation Air Conditioning (RHVAC) Module. TEST the system for normal operation.
No
INSTALL a new PCSM-2. REFER to Passenger Climate - Controlled Seat Module (PCSM-2) Passenger Climate - Controlled Seat Module (PCSM-2). CLEAR the DTCs. REPEAT the self-test.
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