Page 1606 of 4500
Fig. 14: Connecting Cable Of Hand-Held Tester (With CAN VIM) To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.INSPECT BATTERY VOLTAGE
Standard: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
HINT:
While the climate control seat is operated, if the indicator of the climate control switch blinks in any of the
patterns shown in the illustration, the climate control ECU will enter fail-safe mode.
Page 1607 of 4500
Fig. 15: Climate Control Switch Blinking Patterns
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
After identifying the blinking pattern, troubleshoot according to the flow chart below.
Fig. 16: Diagnostic Trouble Code Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CIRCUIT DESCRIPTION
As a result of a short circuit, overcurrent may occur in the Peltier element of the seat climate controller, fan
motor or rear seat heater. If this happens, output from the Peltier element, fan motor, rear seat heater and idle-up
signal (not including the front passenger side) will be stopped and the indicator illuminates according to
blinking pattern 1.
WIRING DIAGRAM
Page 1608 of 4500
Fig. 17: Climate Control Does Not Operate (Blinking Pattern 1) Wiring Diagram (1 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 1609 of 4500
Fig. 18: Climate Control Does Not Operate (Blinking Pattern 1) Wiring Diagram (2 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 1610 of 4500
Fig. 19: Climate Control Does Not Operate (Blinking Pattern 1) Wiring Diagram (3 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CLIMATE CONTROL SWITCH (INDICATOR)
a. Check that the climate control indicator is blinkin
g.
Page 1611 of 4500
Result:
RESULT REFERENCE
B: Go to step 5
A: Go to next step
2.CHECK SEAT CLIMATE CONTROL CONTROLLER (SEATBACK)
HINT:
When the driver side indicator is blinking, check the driver side connector. When the passenger side
indicator is blinking, check the passenger side connector.
a. Disconnect the S34 or S35 controller connector.
b. Connect the wire harness to terminal 4 (TDB-) and 5 (TDB+) of the wire harness side connector.
c. Turn the ignition switch ON.
d. Turn the climate control switch ON, then check that the climate control indicator continues
blinking.
Result:
RESULT REFERENCE
ResultProceed to
Front climate control switch indicator is blinkingA
Rear climate control switch indicator is blinkingB
ResultProceed to
Indicator continues blinkingA
Indicator turns offB
Page 1612 of 4500
Fig. 20: Checking Seat Climate Control Controller (Seatback)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
B: REPLACE SEAT CLIMATE CONTROL CONTROLLER (SEATBACK)
A: Go to next step
3.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - CLIMATE CONTROLLER)
HINT:
When the driver side indicator is blinking, check the driver side connector. When the passenger side
indicator is blinking, check the passenger side connector.
a. Disconnect the C20 or C21 blower connector.
b. Disconnect the S34 or S35 controller connector.
c. Measure the resistance of the wire harness side connectors.
Standard:
Page 1614 of 4500
Fig. 21: Identifying Seat Climate Control Blower Connector And Seat Climate Controller