Pinpoint Test AB: DTC B19A1
Seats
Pinpoint Test AB: DTC B19A1
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) supplies a speed control signal voltage to the passenger seat cushion Thermo-Electric Device (TED) on circuit VHS23 (BN/BU). 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 B19A1 (Passenger Seat Cushion Blower Speed Short to Battery)- If the passenger seat cushion 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 AB : DTC B19A1
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.
AB1 CHECK CUSHION 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-3, circuit VHS23 (BN/BU), harness side and ground.
Is any voltage present?
Yes
GO to AB2.
No
GO to AB3.
AB2 CHECK CUSHION TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Cushion TED (Thermo-Electric Device) C3040.
- Measure the voltage between DCSM (Dual Climate Controlled Seat Module) C3265C-3, circuit VHS23 (BN/BU), 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 AB3.
AB3 CHECK CUSHION TED (Thermo-Electric Device) BLOWER SPEED CONTROL AND BLOWER OUTPUT CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Cushion TED (Thermo-Electric Device) C3040.
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265C-3, circuit VHS23 (BN/BU), harness side and C3265C-8, circuit CHS08 (BN/YE), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to AB4.
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.
AB4 CHECK THE CUSHION TED (Thermo-Electric Device) RESISTANCE FOR AN INTERNAL SHORT
- Measure the resistance between cushion TED (Thermo-Electric Device) C3040 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 cushion TED (Thermo-Electric Device). REFER to Seat Cushion 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.