Pinpoint Test AL: DTC B111C
Seats
Pinpoint Tests
Pinpoint Test AL: DTC B111C
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 an open on any of these circuits is detected, the DTC will be set.
- DTC B111C (Passenger Thermo-Electric Driver Open Load) - If the DCSM output circuits 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 open, disconnected or a TED resistance greater than 90,000 ohms is sensed, the DCSM continues normal operation and sets this DTC.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TED assembly
- DCSM
PINPOINT TEST AL: DTC B111C
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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AL1 CHECK THE TED CIRCUITS FOR AN OPEN
- 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.
- Disconnect: Cushion TED C3040.
- Disconnect: Backrest TED C3039.
- Measure the resistance between DCSM C3265A, harness side and cushion TED C3040, harness side; and between DCSM
C3265A, harness side and backrest TED C3039, harness side using the following chart:
- Are the resistances less than 5 ohms?
Yes
GO to AL2.
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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AL2 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
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
GO to AL3.
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AL3 CHECK THE BACKREST AND CUSHION TED RESISTANCE
- Ignition OFF.
- Measure the resistance between:
- backrest TED C3039 pin 1 and pin 3, component side.
- cushion TED C3039 pin 1 and pin 3, component 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 backrest TED resistance is not between 0.9 and 10 ohms, INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device Seat Backrest Thermo-Electric Device. CLEAR the DTCs. REPEAT the self-test.
If cushion TED resistance is not between 0.9 and 10 ohms, 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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