B19A3
Seats
Pinpoint Test AJ: DTC B19A3
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information Electrical Diagrams.
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 RHS03 (GY/OG). The TED (Thermo-Electric Device) blower is supplied operating voltage from DCSM (Dual Climate Controlled Seat Module) output circuit CHS13 (VT/BN) and ground from DCSM (Dual Climate Controlled Seat Module) output circuit CHS03 (GN/BN).
- DTC B19A3 (Driver Seat Cushion Blower Speed Short to Battery)- If the driver seat cushion blower speed circuit is shorted to voltage, 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 AJ : DTC B19A3
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.
AJ1 CHECK THE 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: Driver Seat Side Air Bag C3051.
- Disconnect: Driver Seat Safety Belt Buckle Pretensioner C3049.
- Disconnect: Passenger Seat Side Air Bag C3052.
- Disconnect: Passenger Seat Safety Belt Buckle Pretensioner C3050.
- 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-11, circuit RHS03 (GY/OG), harness side and ground.
Is any voltage present?
Yes
GO to AJ2.
No
GO to AJ3.
AJ2 CHECK THE CUSHION TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: Cushion TED (Thermo-Electric Device) C3035.
- Measure the voltage between C3265C-11, circuit RHS03 (GY/OG), 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 driver seat safety belt buckle pretensioner C3049 and passenger seat safety belt buckle pretensioner C3050.
CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C3052.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
No
GO to AJ3.
AJ3 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) C3035.
- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265C-11, circuit RHS03 (GY/OG), harness side and C3265C-16, circuit CHS13 (VT/BN), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to AJ4.
No
REPAIR the circuits. CLEAR the DTCs. REPEAT the self-test.
DISCONNECT the battery ground cable.
CONNECT driver seat safety belt buckle pretensioner C3049 and passenger seat safety belt buckle pretensioner C3050.
CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C3052.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.
AJ4 CHECK CUSHION TED (Thermo-Electric Device) RESISTANCE FOR AN INTERNAL SHORT
- Measure the resistance between cushion TED (Thermo-Electric Device) C3035 pin 2 and pin 7, component side.
Is the resistance greater than 10,000 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 driver seat safety belt buckle pretensioner C3049 and passenger seat safety belt buckle pretensioner C3050.
CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C3052.
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 driver seat safety belt buckle pretensioner C3049 and passenger seat safety belt buckle pretensioner C3050.
CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C3052.
REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.