Pinpoint Test BD: DTC B19A1

Seats

Pinpoint Test BD: DTC B19A1

Normal Operation

The Passenger Climate Controlled Seat Module - 2 (PCSM-2) supplies a speed control signal voltage to the RH rear seat cushion Thermo-Electric Device (TED) on circuit VHS65 (VT/WH). The TED (Thermo-Electric Device) blower is supplied operating voltage from PCSM-2 (Passenger Climate Controlled Seat Module - 2) output circuit CHS63 (VT) and ground from PCSM-2 (Passenger Climate Controlled Seat Module - 2) output circuit RHS63 (WH/GN).

- DTC B19A1 (Passenger Seat Cushion Blower Speed Short to Battery)- If the RH rear seat cushion blower speed circuit is shorted to voltage, the PCSM-2 (Passenger Climate Controlled Seat Module - 2) will shut down the RH rear 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

- PCSM-2 (Passenger Climate Controlled Seat Module - 2)

PINPOINT TEST BD : DTC B19A1

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.

BD1 CHECK CUSHION TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

- Disconnect: PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365C.

- Ignition ON.

- Measure the voltage between C3365C-3, circuit VHS65 (VT/WH), harness side and ground.




Is any voltage present?

Yes
GO to BD2.

No
GO to BD3.

BD2 CHECK CUSHION TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

- Disconnect: Cushion TED (Thermo-Electric Device) C3359.

- Measure the voltage between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365C-3, circuit VHS65 (VT/WH), harness side and ground.




Is any voltage present?

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

No
GO to BD3.

BD3 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) C3359.

- Measure the resistance between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365C-3, circuit VHS65 (VT/WH), harness side and C3365C-8, circuit CHS63 (VT), harness side.




Is the resistance greater than 10,000 ohms?

Yes
GO to BD4.

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

BD4 CHECK THE CUSHION TED (Thermo-Electric Device) RESISTANCE FOR AN INTERNAL SHORT

- Measure the resistance between cushion TED (Thermo-Electric Device) C3359 pin 2 and pin 7, component side.




Is the resistance greater than 2M ohms?

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

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