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Pinpoint Test BA: DTCs B1113 and B111B




Seats

Pinpoint Test BA: DTCs B1113 and B111B

Normal Operation

The Passenger Climate Controlled Seat Module - 2 (PCSM-2) monitors the RH 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 B1113 (Passenger 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 RH rear seat system and set this DTC.

- DTC B111B (Passenger Thermo-Electric Driver Overcurrent Low)- If PCSM-2 (Passenger Climate Controlled Seat Module - 2) outputs to the RH rear seat backrest or cushion TED (Thermo-Electric Device) (circuit pins A, B, C or D 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 ohms is sensed, 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) assembly

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

PINPOINT TEST BA : DTCs B1113 AND B111B

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.

BA1 CHECK TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Ignition OFF.

- 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-A CHS43 (GY/BU) C3365A-B RHS43 (VT/GY) C3365A-C CHS44 (GN/VT) C3365A-D RHS44 (BU/WH)






Are the resistances greater than 10,000 ohms?

Yes
GO to BA2.

No
If the resistance between C3365A-A and/or C3365A-B to ground is not greater than 10,000 ohms, GO to BA6.

If the resistance between C3365A-C and/or C3365A-D to ground is not greater than 10,000 ohms, GO to BA7.

BA2 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-A CHS43 (GY/BU) C3365A-B RHS43 (VT/GY) C3365A-C CHS44 (GN/VT) C3365A-D RHS44 (BU/WH)






Is voltage present on any circuits?

Yes
If voltage is present at C3365A-A and/or C3365A-B, GO to BA8.

If voltage is present at C3365A-C and/or C3365A-D, GO to BA9.

No
GO to BA3.

BA3 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-A, circuit CHS43 (GY/BU), harness side and PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-B, circuit RHS43 (VT/GY), harness side.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-C, circuit CHS44 (GN/VT), harness side and C3365A-D, circuit RHS44 (BU/WH), 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-A and C3365A-B is not between
0.9 and 10 ohms, GO to BA5.

If the resistance between PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-C and C3365A-D is not between
0.9 and 10 ohms, GO to BA4.

BA4 CHECK BACKREST TED (Thermo-Electric Device) RESISTANCE

- Disconnect: Backrest TED (Thermo-Electric Device) C3361.

- Measure the resistance between backrest TED (Thermo-Electric Device) C3361 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.

BA5 CHECK CUSHION TED (Thermo-Electric Device) RESISTANCE

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

- Measure the resistance between cushion TED (Thermo-Electric Device) C3359 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.

BA6 CHECK CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

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

- Measure the resistance between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-A, circuit CHS43 (GY/BU), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-B, circuit RHS43 (VT/GY), 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.

BA7 CHECK BACKREST TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Backrest TED (Thermo-Electric Device) C3361.

- Measure the resistance between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-C, circuit CHS44 (GN/VT), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-D, circuit RHS44 (BU/WH), 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.

BA8 CHECK CUSHION TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

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

- Ignition ON.

- Measure the voltage between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-A, circuit CHS43 (GY/BU), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-B, circuit RHS43 (VT/GY), 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.

BA9 CHECK BACKREST TED (Thermo-Electric Device) CIRCUITS FOR A SHORT TO VOLTAGE

- Disconnect: Backrest TED (Thermo-Electric Device) C3361.

- Ignition ON.

- Measure the voltage between:
- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-C, circuit CHS44 (GN/VT), harness side and ground.

- PCSM-2 (Passenger Climate Controlled Seat Module - 2) C3365A-D, circuit RHS44 (BU/WH), 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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