Pinpoint Test AB: DTC B19A2
Seats
Pinpoint Tests
Pinpoint Test AB: DTC B19A2
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 passenger seat backrest Thermo-Electric Device (TED) on circuit VHS21 (BU/WH). The TED blower is supplied operating voltage from DCSM output circuit CHS08 (BN/YE) and ground from DCSM 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 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 and blower assembly
- DCSM
PINPOINT TEST AB: DTC B19A2
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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AB1 CHECK BACKREST TED BLOWER SPEED CONTROL CIRCUIT VHS21 (BU/WH) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Air Bag Systems.
- Disconnect: Passenger Seat Side Air Bag C313.
- Disconnect: 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.
- Ignition ON.
- Measure voltage between C3305c-4, circuit VHS21 (BU/WH), harness side and ground.
- Is any voltage present?
Yes
GO to AB2.
No
GO to AB3.
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AB2 CHECK BACKREST TED BLOWER SPEED CONTROL CIRCUIT VHS21 (BU/WH) FOR A SHORT TO VOLTAGE
- Disconnect: Backrest TED C3311.
- Measure voltage between DCSM C3305c-4, circuit VHS21 (BU/WH), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS. REFER to Air Bag Systems.
No
GO to AB3.
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AB3 CHECK BACKREST TED BLOWER SPEED CONTROL AND BLOWER OUTPUT CIRCUITS VHS21 (BU/WH) AND CHS08 (BN/YE) FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect: Backrest TED C3311.
- Measure resistance between DCSM C3305c-4, circuit VHS21 (BU/WH), harness side and C3305c-8, circuit CHS08 (BN/YE), harness side.
- Is resistance greater than 10,000 ohms?
Yes
GO to AB4.
No
REPAIR the circuits. REPEAT the self-test. CLEAR the DTCs.
DISCONNECT the battery ground cable.
CONNECT passenger seat side air bag module C313.
REPOWER the SRS. REFER to Air Bag Systems.
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AB4 CHECK BACKREST TED RESISTANCE FOR AN INTERNAL SHORT
- Measure resistance between backrest TED C3311 pin 2 and pin 7, component side.
- Is resistance greater than 2,000,000 ohms?
Yes
INSTALL a new DCSM and CARRY OUT Programmable Module Installation (PMI). 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 passenger seat side air bag module C313.
REPOWER the SRS. REFER to Air Bag Systems.
No
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 passenger seat side air bag module C313.
REPOWER the SRS. REFER to Air Bag Systems.
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