DESCRIPTION When the seat
heater switch of the seat heater switch (radio and display receiver
assembly) is operated, the air conditioning amplifier assembly receives a
signal and operates the front seat heater. WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- If the auxiliary battery voltage becomes low, auxiliary battery load
control will operate in order to ensure sufficient power is supplied to
the power steering system. In this case, the seat heater system (for HV
model) may not operate.
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE (a) Clear the DTCs.
Click here  Body Electrical > Air Conditioner > Clear DTCs
|
NEXT |
 | |
(a) Check for DTCs.
Click here Body Electrical > Air Conditioner > Trouble Codes
OK: DTC B14B5 and B14C1 are not output.
| NG |
 | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
OK | |
| |
| 3. |
PERFORM ACTIVE TEST USING TECHSTREAM | (a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream. Body Electrical > Air Conditioner > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
Front Left Seat Heater |
Front seat LH side seat heater operation |
OFF or ON | - | Body Electrical > Air Conditioner > Active Test
|
Tester Display | | Front Left Seat Heater |
OK: The seat heater operates normally.
| OK |
| REPLACE SEAT HEATER SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) |
|
NG | |
| |
| 4. |
INSPECT FRONT SEATBACK HEATER ASSEMBLY LH |
(a) Remove the front seatback heater assembly LH. Click here
(b) Inspect the front seatback heater assembly LH.
Click here
| NG |
| REPLACE FRONT SEATBACK HEATER ASSEMBLY LH |
|
OK | |
| |
| 5. |
CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - FRONT SEAT CUSHION HEATER ASSEMBLY LH - BODY GROUND) |
| (a) Disconnect the R26 front seat cushion heater assembly LH connector. |
 |
|
*a | Front view of wire harness connector
(to Front Seat Cushion Heater Assembly LH) | | |
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
R26-1 (B) - Body ground |
Power switch on (IG) |
11 to 14 V | |
R26-1 (B) - Body ground |
Power switch off | Below 1 V |
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
R26-2 (E) - Body ground |
Always | Below 1 Ω |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 6. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER ASSEMBLY LH) |
| (a) Reconnect the R26 front seat cushion heater assembly LH connector. |
 |
|
*a | Front view of wire harness connector
(to Air Conditioning Amplifier Assembly) | | |
(b) Disconnect the G37 air conditioning amplifier assembly connector. (c) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G37-15 (SHD+) - Body ground |
Power switch on (IG) |
5 to 13 V |
| NG |
| GO TO STEP 8 |
|
OK | |
| |
| 7. |
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
(a) Reconnect the G37 air conditioning amplifier assembly connector. (b) Remove the air conditioning amplifier assembly with its connectors still connected.
Click here (c) Measure the voltage according to the value(s) in the table below.
|
*a | Component with harness connected
(Air Conditioning Amplifier Assembly) |
- | - |
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G37-15 (SHD+) - G35-4 (GND) |
Power switch on (IG), seat heater switch (radio and display receiver assembly) on (LO) |
Below 1 V |
| OK |
| REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH |
| NG |
| REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| 8. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER ASSEMBLY LH) |
(a) Disconnect the R26 front seat cushion heater assembly LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G37-15 (SHD+) - R26-6 (SWL) |
Always | Below 1 Ω |
| OK |
| REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
