Pinpoint Test AI: DTC B19A7
Seats
Pinpoint Test AI: DTC B19A7
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. [1][2]Diagrams By Number
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) supplies voltage and ground to the driver seat cushion Thermo-Electric Device (TED). The DCSM (Dual Climate Controlled Seat Module) also sends a speed control voltage signal to the TED (Thermo-Electric Device) to control blower speed.
- DTC B19A7 (Driver Seat Cushion Blower Speed Short to Ground)- If the driver seat cushion 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 AI : DTC B19A7
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: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to Restraints and Safety Systems &/or Air Bag Systems.
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS (Supplemental Restraint System) fault.
NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.
AI1 CHECK THE CUSHION TED (Thermo-Electric Device) BLOWER MOTOR 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 C327.
- Disconnect: Passenger Seat Side Air Bag C313.
- Disconnect: DCSM (Dual Climate Controlled Seat Module) C3305C.
- Disconnect: Cushion TED (Thermo-Electric Device) C3300.
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3305C-11, circuit VHS18 (BN/GN), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to AI2.
No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
CONNECT driver seat side air bag module C327.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
AI2 CHECK THE CUSHION TED (Thermo-Electric Device) BLOWER MOTOR SPEED CONTROL AND BLOWER MOTOR GROUND CIRCUITS FOR A SHORT TOGETHER
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3305C-11, circuit VHS18 (BN/GN), harness side and C3305C-15, circuit RHS03 (GY/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new cushion TED (Thermo-Electric Device). REFER to Seat Cushion Thermo-Electric Device . REPEAT the self-test. CLEAR the DTCs.
DISCONNECT the battery ground cable.
CONNECT driver seat side air bag module C327.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
REPAIR the circuits. REPEAT the self-test. CLEAR the DTCs.
CONNECT driver seat side air bag module C327.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.