Pinpoint Test AI: DTC B19A8

Seats

Pinpoint Test AI: DTC B19A8

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 VHS16 (BU/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 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 AI : 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.

AI1 CHECK 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 C3134.

- Disconnect: Driver Safety Belt Buckle Pretensioner C3065.

- Disconnect: Passenger Seat Side Air Bag C3133.

- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.

- 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 VHS16 (BU/GN), harness side and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to AI2.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

DISCONNECT the battery ground cable.

CONNECT passenger safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C3133.

CONNECT driver safety belt buckle pretensioner C3065.

CONNECT driver seat side air bag module C3134.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AI2 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 VHS16 (BU/GN), harness side and C3265C-15, circuit RHS03 (GY/OG), 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.

DISCONNECT the battery ground cable.

CONNECT passenger safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C3133.

CONNECT driver safety belt buckle pretensioner C3065.

CONNECT driver seat side air bag module C3134.

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 safety belt buckle pretensioner C3066.

CONNECT passenger seat side air bag module C3133.

CONNECT driver safety belt buckle pretensioner C3065.

CONNECT driver seat side air bag module C3134.

REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.