Pinpoint Test Q: DTCs B1113 and B111B

Seats

Pinpoint Tests

Pinpoint Test Q: DTCs B1113 and B111B

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

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

- DTC B1113 (Passenger Thermal Electric Device Control Overtemperature Fault) - If the DCSM TED driver integrated circuit temperature exceeds 175°C (347°F), the DCSM shuts down the passenger seat system and sets this DTC.
- DTC B111B (Passenger Thermoelectric Driver Overcurrent Low) - If DCSM outputs to the passenger seat backrest or cushion TED (circuit pin A, B, C or D at the DCSM connector) or any components within these circuit loops are shorted to ground or a TED resistance of less than 0.9 ohms is sensed, the DCSM shuts down the passenger seat system and sets this DTC.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TED assembly
- DCSM

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.

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Q1 CHECK THE TED 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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 fault.

NOTE: The SRS 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. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect the passenger seat side air bag module C339.
- Connect the battery ground cable. Refer to Battery, Mounting and Cables Battery Disconnect / Connect.
- Disconnect: DCSM C3265A.
- Measure the resistance between DCSM C3265A, harness side and ground using the following chart:

- 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.

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Q2 CHECK THE TED CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition ON.
- Measure the voltage between DCSM C3265A, harness side and ground using the following chart:

- 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.

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Q3 CHECK THE TED AND WIRING RESISTANCE

- Ignition OFF.
- Measure the resistance between:
- DCSM C3265A-A, circuit CHS07 (GY/BU), harness side and DCSM C3265A-B, circuit RHS07 (BU), harness side.
- DCSM 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 C3265A-A and C3265A-B is not between 0.9 and 10 ohms, GO to Q5.

If the resistance is between DCSM C3265A-C and C3265A-D is not between 0.9 and 10 ohms, GO to Q4.

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Q4 CHECK THE PASSENGER BACKREST TED RESISTANCE

- Disconnect: Passenger Backrest TED C3039.
- Measure the resistance between passenger backrest TED 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
INSTALL a new passenger backrest TED. REFER to Seat Backrest - Front, Bucket Seat 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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Q5 CHECK THE PASSENGER CUSHION TED RESISTANCE

- Disconnect: Passenger Cushion TED C3040.
- Measure the resistance between passenger cushion TED 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
INSTALL a new passenger cushion TED. REFER to Seat Cushion - Front, Bucket Seat 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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Q6 CHECK THE CUSHION TED CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Passenger Cushion TED C3040.
- Measure the resistance between:
- DCSM C3265A-A, circuit CHS07 (GY/BU), harness side and ground.
- DCSM C3265A-B, circuit RHS07 (BU), harness side and ground.

- Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new passenger cushion TED. REFER to Seat Cushion - Front, Bucket Seat 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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Q7 CHECK THE PASSENGER BACKREST TED CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Passenger Backrest TED C3039.
- Measure the resistance between:
- DCSM C3265A-C, circuit CHS06 (BU/BN), harness side and ground.
- DCSM C3265A-D, circuit RHS06 (WH), harness side and ground.

- Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new passenger backrest TED. REFER to Seat Backrest - Front, Bucket Seat 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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Q8 CHECK THE PASSENGER CUSHION TED CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition OFF.
- Disconnect: Passenger Cushion TED C3040.
- Ignition ON.
- Measure the voltage between:
- DCSM C3265A-A, circuit CHS07 (GY/BU), harness side and ground.
- DCSM 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
INSTALL a new passenger backrest TED. REFER to Seat Backrest - Front, Bucket Seat 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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Q10 CHECK FOR CORRECT DCSM OPERATION

- Disconnect all the DCSM electrical connectors.
- Check the harness and component side connectors for the following:

- corrosion.
- damaged pins.
- pushed-out pins.
- Connect all the DCSM electrical connectors and make sure they seat correctly.
- Start the engine.
- Operate the climate controlled seats and verify system operation.
- CLEAR all CMDTCs.
- Enter the following diagnostic mode on the scan tool: Self Test - DCSM.
- Is DTC B1113 or B111B still present?

Yes
INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) Service and Repair. CLEAR all CMDTCs. 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all CMDTCs. 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. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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