Pinpoint Test AC: DTC B19A2
Seats
Pinpoint Test AC: DTC B19A2
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) supplies a speed control signal voltage to the passenger seat backrest Thermo-Electric Device (TED) on circuit VHS21 (BU/WH). The TED (Thermo-Electric Device) blower is supplied operating voltage from DCSM (Dual Climate Controlled Seat Module) output circuit CHS08 (BN/YE) and ground from DCSM (Dual Climate Controlled Seat Module) output circuit RHS08 (VT/WH).
- DTC B19A2 (Passenger Seat Back Blower Speed Short to Battery)- If the passenger seat backrest blower speed circuit is shorted to voltage, the DCSM (Dual Climate Controlled Seat Module) 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 (Thermo-Electric Device) and blower assembly
- DCSM (Dual Climate Controlled Seat Module)
PINPOINT TEST AC : DTC B19A2
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.
AC1 CHECK BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- 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: Passenger Seat Side Air Bag C3133.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3066.
- Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265c.
- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
Connect the battery ground cable.
- Ignition ON.
- Measure the voltage between C3265C-4, circuit VHS21 (BU/WH), harness side and ground.
Is any voltage present?
Yes
GO to AC2.
No
GO to AC3.
AC2 CHECK BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Backrest TED (Thermo-Electric Device) C3039.
- Measure the voltage between DCSM (Dual Climate Controlled Seat Module) C3265C-4, circuit VHS21 (BU/WH), harness side and ground.
Is any voltage present?
Yes
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.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
GO to AC3.
AC3 CHECK BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL AND BLOWER OUTPUT CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Backrest TED (Thermo-Electric Device) C3039.
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265C-4, circuit VHS21 (BU/WH), harness side and C3265C-8, circuit CHS08 (BN/YE), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to AC4.
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.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
AC4 CHECK THE BACKREST TED (Thermo-Electric Device) RESISTANCE FOR AN INTERNAL SHORT
- Measure the resistance between backrest TED (Thermo-Electric Device) C3039 pin 2 and pin 7, component side.
Is the resistance greater than 2M ohms?
Yes
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 safety belt buckle pretensioner C3066.
CONNECT passenger seat side air bag module C3133.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
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.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.