B19A8
Seats
Pinpoint Test AO: DTC B19A8
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information Electrical Diagrams.
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) supplies a speed control signal voltage to the driver seat backrest Thermo-Electric Device (TED) on circuit CHS04 (YE/GY). The TED (Thermo-Electric Device) blower is supplied operating voltage from DCSM (Dual Climate Controlled Seat Module) output circuit CHS13 (VT/BN) and ground from DCSM (Dual Climate Controlled Seat Module) output circuit CHS03 (GN/BN).
- DTC B19A8 (Driver Seat Back Blower Speed Short to Ground)- If the driver seat backrest blower speed circuit is shorted to ground, the DCSM (Dual Climate Controlled Seat Module) will shut down the driver seat system and set this DTC.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TED (Thermo-Electric Device) and blower assembly
- DCSM (Dual Climate Controlled Seat Module)
PINPOINT TEST AO : DTC B19A8
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.
AO1 CHECK THE BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT 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: Driver Seat Side Air Bag C3051.
- Disconnect: Driver Seat Safety Belt Buckle Pretensioner C3049.
- Disconnect: Passenger Seat Side Air Bag C3052.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3050.
- Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265C.
- Disconnect: Backrest TED (Thermo-Electric Device) C3034.
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265C-12, circuit CHS04 (YE/GY), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to AO2.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT driver seat safety belt buckle pretensioner C3049 and passenger seat safety belt buckle pretensioner C3050.
CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C3052.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
AO2 CHECK BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT AND BLOWER GROUND CIRCUIT FOR A SHORT TOGETHER
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265C-12, circuit CHS04 (YE/GY), harness side and C3265C-15, circuit CHS03 (GN/BN), harness side.
Is the resistance 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.
If the DTC is retrieved again, 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 driver seat safety belt buckle pretensioner C3049 and passenger seat safety belt buckle pretensioner C3050.
CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C3052.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
REPAIR the circuits. CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT driver seat safety belt buckle pretensioner C3049 and passenger seat safety belt buckle pretensioner C3050.
CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C3052.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.