Pinpoint Test AL: DTC B19A5
Seats
Pinpoint Tests
Pinpoint Test AL: DTC B19A5
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) supplies a speed control signal voltage to the passenger seat cushion Thermo-Electric Device (TED) on circuit RHS08 (VT/WH). The TED blower is supplied operating voltage from DCSM output circuit CHS14 (GN) and ground from DCSM output circuit CHS08 (BN/YE).
- DTC B19A5 (Passenger Seat Cushion Blower Speed Short to Ground) - If the passenger seat cushion blower speed circuit is shorted to ground, 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 and blower assembly
- DCSM
PINPOINT TEST AL: DTC B19A5
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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AL1 CHECK CUSHION TED BLOWER SPEED CONTROL CIRCUIT 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 Side Air Bag C3052.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3050.
- Disconnect: DCSM C3265C.
- Disconnect: Cushion TED C3040.
- Measure the resistance between DCSM C3265C-3, circuit RHS08 (VT/WH), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to AL2.
No
REPAIR the 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.
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AL2 CHECK THE CUSHION TED BLOWER SPEED CONTROL CIRCUIT AND BLOWER GROUND CIRCUIT FOR A SHORT TOGETHER
- Measure the resistance between DCSM C3265C-3, circuit RHS08 (VT/WH), harness side and C3265C-7, circuit CHS08 (BN/YE), harness side.
- Is the resistance 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.
If the DTC is retrieved again, 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
REPAIR the circuits. 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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