Pinpoint Test AK: DTCs B1113 and B111B

Seating

Pinpoint Test AK: DTCs B1113 and B111B

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

Normal Operation

The Dual Climate Controlled Seat Module (DCSM) monitors the Thermo-Electric Device (TED) circuits. If a short to ground or voltage on any of these circuits is detected, the DTC(s) will be set.

- DTC B1113 (Passenger Thermo-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) will shut down the passenger seat system and set this DTC.

- DTC B111B (Passenger Thermo-Electric Driver Overcurrent Low)- 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 shorted to ground or a TED (Thermo-Electric Device) resistance of less than 0.9 ohm is sensed, the DCSM (Dual Climate Controlled Seat Module) will shut down the passenger seat system and set 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 AK : DTCs B1113 AND B111B

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 switch is ON.

NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

AK1 CHECK THE TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- 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 C339.

- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.

- 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:

Are the resistances greater than 10,000 ohms?

Yes
GO to AK2.

No
If the resistance between C3265A-A and/or C3265A-B to ground is not greater than 10,000 ohms, GO to AK6.

If the resistance between C3265A-C and/or C3265A-D to ground is not greater than 10,000 ohms, GO to AK7.

AK2 CHECK THE 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 voltage between DCSM (Dual Climate Controlled Seat Module) C3265A, harness side and ground using the following chart:

Is voltage present on any circuits?

Yes
If voltage is present at C3265A-A and/or C3265A-B, GO to AK8.

If voltage is present at C3265A-C and/or C3265A-D, GO to AK9.

No
GO to AK3.

AK3 CHECK THE RESISTANCE OF THE TED (Thermo-Electric Device) AND WIRING

- 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
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 seat safety belt buckle pretensioner C3066.

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
If the resistance between DCSM (Dual Climate Controlled Seat Module) C3265A-A and C3265A-B is not between 0.9 and 10 ohms, GO to AK5.

If the resistance between DCSM (Dual Climate Controlled Seat Module) C3265A-C and C3265A-D is not between 0.9 and 10 ohms, GO to AK4.

AK4 CHECK THE BACKREST TED (Thermo-Electric Device) RESISTANCE

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

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

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

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 backrest TED (Thermo-Electric Device). REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AK5 CHECK THE CUSHION TED (Thermo-Electric Device) RESISTANCE

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

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

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

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 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 seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AK6 CHECK THE CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Disconnect: 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 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 seat safety belt buckle pretensioner C3066.

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.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AK7 CHECK THE BACKREST TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Disconnect: 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 backrest TED (Thermo-Electric Device). REFER to Seat Backrest Thermo-Electric Device . CLEAR the DTCs. REPEAT the self-test.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

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.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AK8 CHECK THE CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

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

- Ignition ON.

- Measure 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 voltage present on either circuit?

Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

DISCONNECT the battery ground cable.

CONNECT passenger seat safety belt buckle pretensioner C3066.

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 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 seat safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C339.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AK9 CHECK THE BACKREST TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

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

- Ignition ON.

- Measure voltage 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.