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Pinpoint Test AX: DTCs B103B and B1111




Seats

Pinpoint Test AX: DTCs B103B and B1111

Normal Operation

The Passenger Climate Controlled Seat Module - 2 (PCSM-2) monitors the LH rear seat Thermo-Electric Device (TED) circuits. If a short to ground or voltage on any of these circuits is detected, the DTC(s) will be set.

- DTC B103B (Thermo-Electric Driver Overcurrent Low)- If PCSM-2 (Passenger Climate Controlled Seat Module - 2) outputs to the LH rear seat backrest or cushion TED (Thermo-Electric Device) (circuit pins G, H, J or K at the PCSM-2 (Passenger Climate Controlled Seat Module - 2) connector) or any components within these circuit loops are shorted to ground or a TED (Thermo-Electric Device) resistance of less than 0.9 ohm is sensed, the PCSM-2 (Passenger Climate Controlled Seat Module - 2) will shut down the LH rear seat system and set this DTC.

- DTC B1111 (Driver Thermo-Electric Device Control Overtemperature Fault)- If the PCSM-2 (Passenger Climate Controlled Seat Module - 2) TED (Thermo-Electric Device) driver integrated circuit temperature exceeds 175°C (347°F), 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) assembly

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

PINPOINT TEST AX : DTCs B103B AND B1111

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.

AX1 CHECK TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Disconnect: PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A.

- Measure the resistance between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A, harness side and ground using the following chart:

Connector-Pin Circuit C3365A-G CHS39 (GN/BU) C3365A-H RHS39 (VT/OG) C3365A-J CHS40 (GY/VT) C3365A-K RHS40 (BU/BN)






Are the resistances greater than 10,000 ohms?

Yes
GO to AX2.

No
If the resistance of C3365A-G, circuit CHS39 (GN/BU) and/or C3365A-H, circuit RHS39 (VT/OG) to ground is not greater than 10,000 ohms to ground, GO to AX6.

If the resistance of C3365A-J, circuit CHS40 (GY/VT) and/or C3365A-K, circuit RHS40 (BU/BN) to ground is not greater than 10,000 ohms to ground, GO to AX7.

AX2 CHECK TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition ON.

- Measure the voltage between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A, harness side and ground using the following chart:

Connector-Pin Circuit C3365A-G CHS39 (GN/BU) C3365A-H RHS39 (VT/OG) C3365A-J CHS40 (GY/VT) C3365A-K RHS40 (BU/BN)






Is voltage present on any circuits?

Yes
If voltage is present at C3365A-G and/or C3365A-H, GO to AX8.

If voltage is present at C3365A-J and/or C3365A-K, GO to AX9.

No
GO to AX3.

AX3 CHECK THE RESISTANCE OF THE TED (Thermo-Electric Device) AND WIRING

- Ignition OFF.

- Measure the resistance between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-G, circuit CHS39 (GN/BU), harness side and PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-H, circuit RHS39 (VT/OG), harness side.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-J, circuit CHS40 (GY/VT), harness side and C3365A-K, circuit RHS40 (BU/BN), harness side.





Are the resistances between 0.9 and 10 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
If the resistance between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-G and C3365A-H is not between 0.9 and 10 ohms, GO to AX5.

If the resistance between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-J and C3365A-K is not between 0.9 and 10 ohms, GO to AX4.

AX4 CHECK BACKREST TED (Thermo-Electric Device) RESISTANCE

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

- Measure the resistance between backrest TED (Thermo-Electric Device) C3362 pin 1 and pin 3, component side.




Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

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

AX5 CHECK CUSHION TED (Thermo-Electric Device) RESISTANCE

- Disconnect: Cushion TED (Thermo-Electric Device) C3358.

- Measure the resistance between cushion TED (Thermo-Electric Device) C3358 pin 1 and pin 3, component side.




Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the circuit(s). 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.

AX6 CHECK CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Cushion TED (Thermo-Electric Device) C3358.

- Measure the resistance between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-G, circuit CHS39 (GN/BU), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-H, circuit RHS39 (VT/OG), harness side and ground.





Are the resistances greater than 10,000 ohms?

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

No
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

AX7 CHECK BACKREST TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

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

- Measure the resistance between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-J, circuit CHS40 (GY/VT), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-K, circuit RHS40 (BU/BN), harness side and ground.





Are the resistances 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 circuit(s). CLEAR the DTCs. REPEAT the self-test.

AX8 CHECK CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

- Disconnect: Cushion TED (Thermo-Electric Device) C3358.

- Ignition ON.

- Measure the voltage between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-G, circuit CHS39 (GN/BU), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-H, circuit RHS39 (VT/OG), harness side and ground.





Is voltage present on either circuit?

Yes
REPAIR the circuit(s). 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.

AX9 CHECK BACKREST TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

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

- Ignition ON.

- Measure the voltage between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-J, circuit CHS40 (GY/VT), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-K, circuit RHS40 (BU/BN), harness side and ground.





Is voltage present on either circuit?

Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

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

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