Pinpoint Test AT: DTC B19A7
Seating
Pinpoint Test AT: DTC B19A7
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 driver seat cushion Thermo-Electric Device (TED) on circuit VHS18 (BN/GN). The TED (Thermo-Electric Device) blower is supplied operating voltage from DCSM (Dual Climate Controlled Seat Module) output circuit CHS03 (GN/BN) and ground from DCSM (Dual Climate Controlled Seat Module) output circuit RHS03 (GY/OG).
- 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 AT : 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: 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.
AT1 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 C3051.
- Disconnect: Driver Seat Safety Belt Buckle Pretensioner C3065.
- Disconnect: Passenger Seat Side Air Bag C339.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3066.
- Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265C.
- Disconnect: Cushion TED (Thermo-Electric Device) C3035.
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265C-11, circuit VHS18 (BN/GN), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to AT2.
No
REPAIR the circuit. 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.
CONNECT driver seat safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag C3051.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
AT2 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) C3265C-11, circuit VHS18 (BN/GN), harness side and C3265C-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 . 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 passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C339.
CONNECT driver seat safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag C3051.
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 passenger seat safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C339.
CONNECT driver seat safety belt buckle pretensioner C3065.
CONNECT driver seat side air bag C3051.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.