Pinpoint Test AH: DTC B19A8
Seats
Pinpoint Tests
Pinpoint Test AH: DTC B19A8
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 backrest Thermo-Electric Device (TED) on circuit VHS16 (BU/GN). The TED blower is supplied operating voltage from DCSM output circuit CHS03 (GN/BN) and ground from DCSM 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 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 and blower assembly
- DCSM
PINPOINT TEST AH: DTC B19A8
NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
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.
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AH1 CHECK BACKREST TED BLOWER SPEED CONTROL CIRCUIT VHS16 (BU/GN) FOR A SHORT TO GROUND
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Air Bag Systems.
- Disconnect: Driver Seat Side Air Bag C327.
- Disconnect: DCSM C3305c.
- Disconnect: Backrest TED C3310.
- Measure resistance between DCSM C3305c-12, circuit VHS16 (BU/GN), harness side and ground.
- Is resistance greater than 10,000?
Yes
GO to AH2.
No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
CONNECT driver seat side air bag module C327.
REPOWER the SRS. REFER to Air Bag Systems.
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AH2 CHECK BACKREST TED BLOWER SPEED CONTROL CIRCUIT VHS16 (BU/GN) AND BLOWER GROUND CIRCUIT RHS03 (GY/OG) FOR A SHORT TOGETHER
- Measure resistance between DCSM C3305c-12, circuit VHS16 (BU/GN), harness side and C3305c-15, circuit RHS03 (GY/OG), harness side.
- Is resistance greater than 10,000?
Yes
GO to AH3.
No
REPAIR the circuits. REPEAT the self-test. CLEAR the DTCs.
CONNECT driver seat side air bag module C327.
REPOWER the SRS. REFER to Air Bag Systems.
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AH3 DETERMINE BACKREST TED OR DCSM FAILURE
- Remove the backrest TED from the driver seat. Refer to Seat Backrest Thermo-Electric Device Seat Backrest Thermo-Electric Device.
- Remove the backrest TED from the passenger seat and install it on the driver seat.
- Connect: Cushion TED C3310.
- Connect: Dual Climate Controlled Seat Module (DCSM) C3305c.
- 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. Refer to Battery.
- Start the engine and check operation of the driver seat climate controlled seat system.
- Does the seat operate with the TED from the other seat installed?
Yes
INSTALL a new backrest TED. REFER to Seat Backrest Thermo-Electric Device Seat Backrest Thermo-Electric Device. REPEAT the self-test. CLEAR the DTCs.
DISCONNECT the battery ground cable.
CONNECT driver seat side air bag module C327.
REPOWER the SRS. REFER to Air Bag Systems.
No
INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) Dual Climate Controlled Seat Module (DCSM). REPEAT the self-test.
CLEAR the DTCs.
DISCONNECT the battery ground cable.
CONNECT driver seat side air bag module C327.
REPOWER the SRS. REFER to Air Bag Systems.
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