Pinpoint Test BK: DTC B19A8

Seats

Pinpoint Test BK: DTC B19A8

Normal Operation

The Passenger Climate Controlled Seat Module - 2 (PCSM-2) supplies a speed control signal voltage to the LH rear seat backrest Thermo-Electric Device (TED) on circuit VHS68 (BN/GN). The TED (Thermo-Electric Device) blower is supplied operating voltage from PCSM-2 (Passenger Climate Controlled Seat Module - 2) output circuit CHS67 (VT/BN) and ground from PCSM-2 (Passenger Climate Controlled Seat Module - 2) output circuit RHS67 (WH/BU).

- DTC B19A8 (Driver Seat Back Blower Speed Short to Ground)- If the LH rear seat backrest blower speed circuit is shorted to ground, the PCSM-2 (Passenger Climate Controlled Seat Module - 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 (Thermo-Electric Device) and blower assembly

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

PINPOINT TEST BK : DTC B19A8

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.

BK1 CHECK BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

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

- Disconnect: Backrest TED (Thermo-Electric Device) C3362.

- Measure the resistance between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365C-12, circuit VHS68 (BN/GN), harness side and ground.




Is the resistance greater than 10,000 ohms?

Yes
GO to BK2.

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

BK2 CHECK BACKREST TED (Thermo-Electric Device) BLOWER SPEED CONTROL CIRCUIT AND BLOWER GROUND CIRCUIT FOR A SHORT TOGETHER

- Measure the resistance between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365C-12, circuit VHS68 (BN/GN), harness side and C3365C-15, circuit RHS67 (WH/BU), harness side.




Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new backrest TED (Thermo-Electric Device). REFER to Seat Backrest Thermo-Electric Device - Second Row . CLEAR the DTCs. REPEAT the self-test.

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