Heated Steering Wheel System Steering Wheel Does Not Heat Up When Heated Steering Wheel Switch Is Pressed
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK STEERING HEATER SWITCH (LED OPERATION)
INSPECT STEERING WHEEL ASSEMBLY (THERMISTOR)
INSPECT STEERING WHEEL ASSEMBLY (HEATER·THERMOSTAT)
CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH - SPIRAL CABLE)
INSPECT SPIRAL CABLE SUB-ASSEMBLY
CHECK STEERING HEATER SWITCH
HEATED STEERING WHEEL SYSTEM - Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed |
DESCRIPTION
(LandCruiser RM000002OJD02KX.html)
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK STEERING HEATER SWITCH (LED OPERATION) |
Check the illumination condition of the LED.
- Result:
LED
| Condition
| Proceed to
|
Illuminates
| Engine switch on (IG)
Heated steering wheel switch is pushed
| B
|
Does not illuminate
| Engine switch on (IG)
Heated steering wheel switch is pushed and held continuously for 10 seconds or more
| A
|
| 2.INSPECT STEERING WHEEL ASSEMBLY (THERMISTOR) |
Disconnect the steering wheel controller connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1 (TH2) - 2 (TH1)
| 10 to 30 °C(50 to 86°F)
| 8.132 to 18.43 kΩ
|
Text in Illustration*a
| Front view of wire harness connector
(to Heated Steering Wheel Controller)
|
| 3.INSPECT STEERING WHEEL ASSEMBLY (HEATER·THERMOSTAT) |
Disconnect the steering wheel controller connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
4 (SH1) - 3 (SH2)
| 20°C (68°F)
| 1.89 to 2.25 Ω
|
Text in Illustration*a
| Front view of wire harness connector
(to Heated Steering Wheel Controller)
|
| 4.CHECK HARNESS AND CONNECTOR (STEERING HEATER SWITCH - SPIRAL CABLE) |
Disconnect the G152 steering heater switch connector.
Disconnect the G151 spiral cable connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
G152-5 (INDC) - G151-1 (BTM)
| Always
| Below 1 Ω
|
G152-4 (RC) - G151-3 (ETM)
| Always
| Below 1 Ω
|
G151-2 (EHT) - Body ground
| Always
| Below 1 Ω
|
Text in Illustration*a
| Front view of wire harness connector
(to Steering Heater Switch)
|
*b
| Front view of wire harness connector
(to Spiral Cable)
|
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
G151-4 (BHT) - Body ground
| Engine switch on (IG)
| 11 to 14 V
|
| | REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR |
|
|
| 5.INSPECT SPIRAL CABLE SUB-ASSEMBLY |
- NOTICE:
- If there are any defects as mentioned below, replace the spiral cable with a new one:
- Scratches, cracks, dents or chips in the connector or spiral cable.
Disconnect the G151 spiral cable connector.
Disconnect the heated steering wheel controller connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1 (CCU) - G151-1 (BTM)
| Always
| Below 1 Ω
|
2 (CCV) - G151-3 (ETM)
| Always
| Below 1 Ω
|
3 (CCX) - G151-2 (EHT)
| Always
| Below 1 Ω
|
4 (CCW) - G151-4 (BHT)
| Always
| Below 1 Ω
|
Text in Illustration*a
| Component without harness connected
(Spiral Cable)
|
*b
| Front view of harness connector
(to Heated Steering Wheel Controller)
|
| 6.CHECK STEERING HEATER SWITCH |
Disconnect the G152 steering heater switch connector.
Measure the voltage according to the value(s) in the table below.
- HINT:
- As the circuit has a diode, perform the measurement in diode test mode and make sure that the polarity is correct.
- Standard Voltage:
Tester Connection
Positive (+) tester probe - Negative (-) tester probe
| Switch Condition
| Specified Condition
|
G152-1 (IG) - G152-4 (RC)
| Heated steering wheel switch is pushed
| Below 1.25 V
|
Text in Illustration*a
| Component without harness connected
(to Steering Heater Switch)
|
