Pinpoint Test AE: DTC B1113/B111B
Seats
Pinpoint Tests
Pinpoint Test AE: DTC B1113/B111B
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
Each climate controlled seat is controlled independently of the other by the Dual Climate Controlled Seat Module (DCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seats only operate with the engine running, however, if using a scan tool, diagnostic testing can be carried out with the ignition ON engine OFF. The system receives voltage from Battery Junction Box (BJB) fuse 67 (40A) supplying battery voltage on circuit SBB08 (VT/RD) into DCSM C3265A pins E and F. If voltage is disconnected from either circuit, both seats will remain operational because voltage supply is internally connected in the DCSM. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled.
Each seat cushion and backrest is equipped with a Thermo-Electric Device (TED) that includes a seat blower that is serviced as an assembly with the TED. Cabin air is drawn through the blower and distributed to each of the TED modules. The TEDs then heat or cool the air and direct it 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 uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the climate controlled seat switch settings.
- DTC B1113 (Passenger Thermoelectric 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 Thermoelectric 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 ohms 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 AE: DTC B1113/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 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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AE1 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3050.
- Disconnect: Passenger Seat Side Air Bag C3052.
- Disconnect: DCSM C3265A.
- 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, Mounting and Cables Battery Disconnect.
- Measure the resistance between the following DCSM C3265A pins, harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to AE2.
No
If the resistances of C3265A-A and/or C3265A-B to ground were not greater than 10,000 ohms to ground, GO to AE6.
If the resistances of C3265A-C and/or C3265A-D to ground were not greater than 10,000 ohms to ground, GO to AE7.
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AE2 CHECK THE TED CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the following DCSM C3265A pins, harness side and ground.
- Is voltage present on any circuit?
Yes
If the voltages measured at C3265A-A and/or C3265A-B were not less than one volt, GO to AE8.
If voltages measured at C3265A-C and/or C3265A-D were not less than one volt, GO to AE9.
No
GO to AE3.
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AE3 CHECK THE TED RESISTANCE
- Ignition OFF.
- NOTICE: Make sure the Thermo-Electric Devices (TEDs) are at room temperature and there is no air blowing across the TEDs. Do not handle a TED when measuring resistance. These conditions can cause incorrect readings and lead to incorrect identification of components that are not faulty
- 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 DCSM C3265A-D, circuit RHS06 (WH), harness side and ground.
- 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 C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
If the resistance between DCSM C3265A-A and C3265A-B was not between 0.9 and 10 ohms, GO to AE5.
If the resistance between DCSM C3265A-C and C3265A-D was not between 0.9 and 10 ohms, GO to AE4.
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AE4 CHECK RESISTANCE OF THE BACKREST TED
- Disconnect: Backrest TED C3039 (10-Way Power Seat) or C3316 (6-Way Power Seat).
- Measure the resistance between backrest TED C3039 (10-way power seat) or C3316 (6-way power seat) pin 1 and pin 3, component side.
- Is the resistance between 0.9 and 10 ohms?
Yes
REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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 C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AE5 CHECK THE RESISTANCE OF THE CUSHION TED
- 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 affected circuit. CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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 C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AE6 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 C3050. CONNECT passenger seat side air bag module C3052.
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.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AE7 CHECK THE BACKREST TED CIRCUITS FOR A SHORT TO GROUND
- Disconnect: Backrest TED C3039 (10-Way Power Seat) or C3316 (6-Way Power Seat).
- 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 C3050. CONNECT passenger seat side air bag module C3052.
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.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AE8 CHECK THE CUSHION TED CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: 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 voltage present on any 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 C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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 C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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AE9 CHECK THE BACKREST TED CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Backrest TED C3039 (10-Way Power Seat) or C3316 (6-Way Power Seat).
- Ignition ON.
- Measure the 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 any 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 C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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 C3050. CONNECT passenger seat side air bag module C3052.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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