B14F4

SEAT: CLIMATE CONTROL SEAT SYSTEM: B14F4: Overcurrent Detected in Seatback Peltier

DTC B14F4 - Overcurrent Detected in Seatback Peltier

DESCRIPTION

The seat climate control ECU stops outputs to the seat climate control controller if a short, etc. in the seat climate control controller, wire harness or ECU interior circuit causes overcurrent.






WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) Check for DTCs Climate Control Seat System.

Result





D -- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER RH)
C -- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER LH)
B -- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER RH)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER LH)




(a) Disconnect the e34 ECU connector.
(b) Disconnect the e51 climate control controller connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
(a) Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK:
DTC is not output
NG -- REPLACE SEAT CLIMATE CONTROL CONTROLLER LH
OK -- REPLACE SEAT CLIMATE CONTROL ECU
4. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER RH)




(a) Disconnect the e4 ECU connector.
(b) Disconnect the e21 climate control controller connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
(a) Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK:
DTC is not output
NG -- REPLACE SEAT CLIMATE CONTROL CONTROLLER RH
OK -- REPLACE SEAT CLIMATE CONTROL ECU
6. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER LH)




(a) Disconnect the f28 ECU connector.
(b) Disconnect the f32 climate control blower connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
(a) Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK:
DTC is not output
NG -- REPLACE REAR SEATBACK CLIMATE CONTROL BLOWER LH
OK -- REPLACE SEAT CLIMATE CONTROL ECU
8. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER RH)




(a) Disconnect the f8 ECU connector.
(b) Disconnect the f12 climate control blower connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
(a) Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK:
DTC is not output

Result





D -- REPLACE REAR SEATBACK CLIMATE CONTROL BLOWER RH
C -- REPLACE REAR SEATBACK CLIMATE CONTROL BLOWER RH
B -- REPLACE SEAT CLIMATE CONTROL ECU
A -- REPLACE SEAT CLIMATE CONTROL ECU