Pinpoint Test Z: DTC B111C
Seats
Pinpoint Test Z: DTC B111C
Normal Operation
Climate controlled seats are independently controlled 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 (Dual Climate Controlled Seat Module), diagnostic testing can be carried out with the ignition ON. The system receives voltage from Battery Junction Box (BJB) fuse 22 (30A) supplying voltage into DCSM (Dual Climate Controlled Seat Module) C3265a pins E and F, circuit CBX01 (GN/RD). If voltage is disconnected from either pin E or F of DCSM (Dual Climate Controlled Seat Module) C3265a both seats will remain operational because the voltage supply circuits are connected internally in the DCSM (Dual Climate Controlled Seat Module). 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 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 (Thermo-Electric Device)). Cabin air is drawn through the blower and distributed to each of the TED (Thermo-Electric Device) modules. The TEDs (Thermo-Electric Devices) 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 (Dual Climate Controlled Seat Module) uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the HVAC module seat switch settings.
- DTC B111C (Passenger Thermo-Electric Driver Open Load)- If DCSM (Dual Climate Controlled Seat Module) outputs to the passenger seat backrest or cushion TED (Thermo-Electric Device) (circuit pins A, B, C or D at the DCSM (Dual Climate Controlled Seat Module) connector) or any components within these circuit loops are open, disconnected or a TED (Thermo-Electric Device) resistance greater than 90,000 ohms is sensed, the DCSM (Dual Climate Controlled Seat Module) continues normal operation and sets this DTC.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TED (Thermo-Electric Device) assembly
- DCSM (Dual Climate Controlled Seat Module)
PINPOINT TEST Z : DTC B111C
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.
NOTE: During testing, wire colors and circuit numbers may change as they pass through connectors.
Z1 CHECK TED (Thermo-Electric Device) CIRCUITS FOR AN OPEN
- Ignition OFF.
- 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: Passenger Seat Side Air Bag C3133.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.
- Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265a.
- Disconnect: Cushion TED (Thermo-Electric Device) C3040.
- Disconnect: Backrest TED (Thermo-Electric Device) C3039.
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265A, harness side and cushion TED (Thermo-Electric Device) C3040, harness side; and between DCSM (Dual Climate Controlled Seat Module) C3265A, harness side and backrest TED (Thermo-Electric Device) C3039, harness side using the following chart:
DCSM (Dual Climate Controlled Seat Module) Connector-Pin Circuit TED (Thermo-Electric Device) Connector-Pin C3265A-A CHS07 (GY/BU) C3040-1 C3265A-B RHS07 (BU) C3040-3 C3265A-C CHS06 (BU/BN) / CHS01 (GY/VT) C3039-1 C3265A-D RHS06 (WH) / RHS01 (WH/VT) C3039-3
Are the resistances less than 5 ohms?
Yes
GO to Z2.
No
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT passenger safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3133.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
Z2 CHECK TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE
- 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.
Connect the battery ground cable.
- Ignition ON.
- Measure the voltage between DCSM (Dual Climate Controlled Seat Module) C3265A, harness side and ground using the following chart:
Connector-Pin Circuit C3265A-A CHS07 (GY/BU) C3265A-B RHS07 (BU) C3265A-C CHS06 (BU/BN) C3265A-D RHS06 (WH)
Is voltage present on any circuits?
Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT passenger safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3133.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
GO to Z3.
Z3 CHECK THE BACKREST TED (Thermo-Electric Device) AND CUSHION TED (Thermo-Electric Device) RESISTANCE
- Ignition OFF.
- Measure the resistance between:
- backrest TED (Thermo-Electric Device) C3039 pin 1 and pin 3, component side.
- cushion TED (Thermo-Electric Device) C3040 pin 1 and pin 3, component side.
Are the resistances between 0.9 and 10 ohms?
Yes
INSTALL a new DCSM (Dual Climate Controlled Seat Module). REFER to Dual Climate Controlled Seat Module (DCSM) . CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT passenger safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3133.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
If backrest TED (Thermo-Electric Device) resistance is not between 0.9 and 10 ohms, INSTALL a new backrest TED (Thermo-Electric Device). REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.
If cushion TED (Thermo-Electric Device) resistance is not between 0.9 and 10 ohms, INSTALL a new cushion TED (Thermo-Electric Device). REFER to Seat Cushion Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT passenger safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3133.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.