Pinpoint Test Q: DTCs B1113 and B111B

Seats

Pinpoint Test Q: DTCs B1113 and B111B

Normal Operation

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) ). When the Dual Climate Controlled Seat Module (DCSM) detects an overcurrent and/or overtemperature in the output circuits to the TEDs (Thermo-Electric Devices), it disables the affected seat and sets the following DTCs:

- DTC B1113 (Passenger Thermal Electric Device Control Overtemperature Fault)- If the DCSM (Dual Climate Controlled Seat Module) TED (Thermo-Electric Device) driver integrated circuit temperature exceeds 175°C (347°F), the DCSM (Dual Climate Controlled Seat Module) shuts down the passenger seat system and sets this DTC.

- DTC B111B (Passenger Thermoelectric Driver Overcurrent Low)- If DCSM (Dual Climate Controlled Seat Module) outputs to the passenger seat backrest or cushion TED (Thermo-Electric Device) (circuit pin A, B, C or D at the DCSM (Dual Climate Controlled Seat Module) connector) or any components within these circuit loops are shorted to ground or a TED (Thermo-Electric Device) resistance of less than 0.9 ohms is sensed, the DCSM (Dual Climate Controlled Seat Module) shuts down the passenger seat system 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 Q : DTCs B1113 AND B111B

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Q1 CHECK THE TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

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: DCSM (Dual Climate Controlled Seat Module) C3265A.

- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265A, harness side and ground using the following chart:

DCSM (Dual Climate Controlled Seat Module) Connector Circuit C3265A-A CHS07 (GY/BU) C3265A-B RHS07 (BU) C3265A-C CHS06 (BU/BN) C3265A-D RHS06 (WH)

Are the resistances greater than 10,000 ohms?

Yes
GO to Q2.

No
If the resistance is between C3265A-A and/or C3265A-B to ground is not greater than 10,000 ohms, GO to Q6.

If the resistance is between C3265A-C and/or C3265A-D to ground is not greater than 10,000 ohms, GO to Q7.

Q2 CHECK THE TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition ON.

- Measure the voltage between DCSM (Dual Climate Controlled Seat Module) C3265A, harness side and ground using the following chart:

DCSM (Dual Climate Controlled Seat Module) Connector Circuit C3265A-A CHS07 (GY/BU) C3265A-B RHS07 (BU) C3265A-C CHS06 (BU/BN) C3265A-D RHS06 (WH)

Is any voltage present on either circuit?

Yes
If voltage is present at C3265A-A and/or C3265A-B, GO to Q8.

If voltage is present at C3265A-C and/or C3265A-D, GO to Q9.

No
GO to Q3.

Q3 CHECK THE TED (Thermo-Electric Device) AND WIRING RESISTANCE

- Ignition OFF.

- Measure the resistance between:
- DCSM (Dual Climate Controlled Seat Module) C3265A-A, circuit CHS07 (GY/BU), harness side and DCSM (Dual Climate Controlled Seat Module) C3265A-B, circuit RHS07 (BU), harness side.

- DCSM (Dual Climate Controlled Seat Module) C3265A-C, circuit CHS06 (BU/BN), harness side and C3265A-D, circuit RHS06 (WH), harness side.

Are the resistances between 0.9 and 10 ohms?

Yes
GO to Q10.

No
If the resistance is between DCSM (Dual Climate Controlled Seat Module) C3265A-A and C3265A-B is not between 0.9 and 10 ohms, GO to Q5.

If the resistance is between DCSM (Dual Climate Controlled Seat Module) C3265A-C and C3265A-D is not between 0.9 and 10 ohms, GO to Q4.

Q4 CHECK THE PASSENGER BACKREST TED (Thermo-Electric Device) RESISTANCE

- Disconnect: Passenger Backrest TED (Thermo-Electric Device) C3039.

- Measure the resistance between passenger backrest TED (Thermo-Electric Device) C3039 pins 1 and 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR circuit(s) CHS06 (BU/BN)/CHS01 (GY/VT) and/or RHS06 (WH)/RHS01 (WH/VT) for an open. CLEAR the DTCs. 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
INSTALL a new passenger backrest TED (Thermo-Electric Device). REFER to Seat Backrest - Front, Bucket Seat . CLEAR the DTCs. 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.

Q5 CHECK THE PASSENGER CUSHION TED (Thermo-Electric Device) RESISTANCE

- Disconnect: Passenger Cushion TED (Thermo-Electric Device) C3040.

- Measure the resistance between passenger cushion TED (Thermo-Electric Device) C3040 pins 1 and 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR circuit(s) CHS07 (GY/BU) and/or RHS07 (BU) for an open. CLEAR the DTCs. 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
INSTALL a new passenger cushion TED (Thermo-Electric Device). REFER to Seat Cushion - Front, Bucket Seat . CLEAR the DTCs. 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.

Q6 CHECK THE CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Passenger Cushion TED (Thermo-Electric Device) C3040.

- Measure the resistance between:
- DCSM (Dual Climate Controlled Seat Module) C3265A-A, circuit CHS07 (GY/BU), harness side and ground.

- DCSM (Dual Climate Controlled Seat Module) C3265A-B, circuit RHS07 (BU), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new passenger cushion TED (Thermo-Electric Device). REFER to Seat Cushion - Front, Bucket Seat . CLEAR the DTCs. 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
REPAIR the circuit(s). CLEAR the DTCs. 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.

Q7 CHECK THE PASSENGER BACKREST TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Passenger Backrest TED (Thermo-Electric Device) C3039.

- Measure the resistance between:
- DCSM (Dual Climate Controlled Seat Module) C3265A-C, circuit CHS06 (BU/BN), harness side and ground.

- DCSM (Dual Climate Controlled Seat Module) C3265A-D, circuit RHS06 (WH), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new passenger backrest TED (Thermo-Electric Device). REFER to Seat Backrest - Front, Bucket Seat . CLEAR the DTCs. 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
REPAIR the circuit(s). CLEAR the DTCs. 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.

Q8 CHECK THE PASSENGER CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: Passenger Cushion TED (Thermo-Electric Device) C3040.

- Ignition ON.

- Measure the voltage between:
- DCSM (Dual Climate Controlled Seat Module) C3265A-A, circuit CHS07 (GY/BU), harness side and ground.

- DCSM (Dual Climate Controlled Seat Module) C3265A-B, circuit RHS07 (BU), harness side and ground.

Is any voltage present on either circuit?

Yes
REPAIR the circuit(s). CLEAR the DTCs. 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
INSTALL a new passenger backrest TED (Thermo-Electric Device). REFER to Seat Backrest - Front, Bucket Seat . CLEAR the DTCs. 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.

Q10 CHECK FOR CORRECT DCSM (Dual Climate Controlled Seat Module) OPERATION

- 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 system operation.

- CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

- Enter the following diagnostic mode on the scan tool: Self Test- DCSM (Dual Climate Controlled Seat Module).

Is DTC B1113 or B111B 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.