Pinpoint Test BF: DTC B19A3

Seats

Pinpoint Tests

Pinpoint Test BF: DTC B19A3

Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number

Normal Operation

The Passenger Climate Controlled Seat Module - 2 (PCSM-2) supplies a speed control signal voltage to the LH rear seat cushion Thermo-Electric Device (TED) on circuit VHS70 (YE). The TED blower is supplied operating voltage from PCSM-2 output circuit CHS67 (VT/BN) and ground from PCSM-2 output circuit RHS67 (WH/BU).

- DTC B19A3 (Driver Seat Cushion Blower Speed Short to Battery) - If the LH rear seat cushion blower speed circuit is shorted to voltage, the PCSM-2 will shut down the LH rear seat system and set this DTC.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TED and blower assembly
- PCSM-2



PINPOINT TEST BF: DTC B19A3

NOTICE: When taking measurements at Passenger Climate Controlled Seat Module - 2 (PCSM-2) 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.

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BF1 CHECK CUSHION TED BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE


- Disconnect: PCSM-2 C3365C.
- Ignition ON.
- Measure the voltage between C3365C-11, circuit VHS70 (YE), harness side and ground.




- Is any voltage present?

Yes
GO to BF2.

No
GO to BF3.

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BF2 CHECK CUSHION TED BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE


- Disconnect: Cushion TED C3358.
- Measure the voltage between C3365C-11, circuit VHS70 (YE), harness side and ground.




- Is any voltage present?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No
GO to BF3.

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BF3 CHECK CUSHION TED BLOWER SPEED CONTROL AND BLOWER OUTPUT CIRCUITS FOR A SHORT TOGETHER


- Ignition OFF.
- Disconnect: Cushion TED C3358.
- Measure the resistance between PCSM-2 C3365C-11, circuit VHS70 (YE), harness side and C3365C-16, circuit CHS67 (VT/BN), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to BF4.

No
REPAIR the circuits. CLEAR the DTCs. REPEAT the self-test.

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BF4 CHECK THE CUSHION TED RESISTANCE FOR AN INTERNAL SHORT


- Measure the resistance between cushion TED C3358 pin 2 and pin 7, component side.




- Is the resistance greater than 2M ohms?

Yes
INSTALL a new PCSM-2. REFER to Passenger Climate - Controlled Seat Module (PCSM-2) Passenger Climate - Controlled Seat Module (PCSM-2).
CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new cushion TED. REFER to Seat Cushion Thermo-Electric Device - Second Row Seat Cushion Thermo-Electric Device - Second Row. CLEAR the DTCs.
REPEAT the self-test.

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