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Pinpoint Test AK: DTCs B1113 And B111B




Seats

Pinpoint Tests

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 TED driver integrated circuit temperature exceeds 175°C (347°F), the DCSM will shut down the passenger seat system and set this DTC.
- DTC B111B (Passenger Thermo-Electric Driver Overcurrent Low) - If DCSM outputs to the passenger seat backrest or cushion TED (circuit pins 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 ohm is sensed, the DCSM 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 assembly
- DCSM



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.

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AK1 CHECK THE TED CIRCUITS FOR A SHORT TO GROUND


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems.
- Disconnect: Passenger Seat Side Air Bag C339.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
- 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 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.

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AK2 CHECK THE TED 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. Refer to Battery.
- Ignition ON.
- Measure voltage between DCSM 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.

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AK3 CHECK THE RESISTANCE OF THE TED AND WIRING


- 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
INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) 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. REFER to Restraint Systems.

No
If the resistance between DCSM C3265A-A and C3265A-B is not between 0.9 and 10 ohms,
GO to AK5.

If the resistance between DCSM C3265A-C and C3265A-D is not between 0.9 and 10 ohms,
GO to AK4.

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AK4 CHECK THE BACKREST TED RESISTANCE


- Disconnect: Backrest TED C3039.
- Measure the resistance between backrest TED 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. REFER to Restraint Systems.

No
INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device 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. REFER to Restraint Systems.

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AK5 CHECK THE CUSHION TED RESISTANCE


- Disconnect: Cushion TED C3040.
- Measure the resistance between cushion TED 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. REFER to Restraint Systems.

No
INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device 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. REFER to Restraint Systems.

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AK6 CHECK THE CUSHION TED CIRCUITS FOR A SHORT TO GROUND


- Disconnect: 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 cushion TED. REFER to Seat Cushion Thermo-Electric Device 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. REFER to Restraint 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. REFER to Restraint Systems.

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AK7 CHECK THE BACKREST TED CIRCUITS FOR A SHORT TO GROUND


- Disconnect: 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 backrest TED. REFER to Seat Backrest Thermo-Electric Device 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. REFER to Restraint 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. REFER to Restraint Systems.

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AK8 CHECK THE CUSHION TED CIRCUITS FOR A SHORT TO VOLTAGE


- Disconnect: Cushion TED C3040.
- Ignition ON.
- Measure voltage between:
- DCSM C3265A-A, circuit CHS07 (GY/BU), harness side and ground.
- DCSM 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. REFER to Restraint Systems.

No
INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device 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. REFER to Restraint Systems.

-------------------------------------------------
AK9 CHECK THE BACKREST TED CIRCUITS FOR A SHORT TO VOLTAGE


- Disconnect: Backrest TED C3039.
- Ignition ON.
- Measure voltage between:
- DCSM C3265A-C, circuit CHS06 (BU/BN), harness side and ground.
- DCSM C3265A-D, circuit RHS06 (WH), 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. REFER to Restraint Systems.

No
INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device 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. REFER to Restraint Systems.

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