Seat Heater for Rear Right Seat does not Operate [12/2023 - ]: Procedure

1. Perform the Active Test according to the display on the GTS.
   1. w/ Front LiDAR Sensor:

      Body Electrical > Air Conditioner > Active Test 

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Rear Right Seat Heater	Rear right side seat heater operation	OFF/ON	-

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Rear Right Seat Heater

   2. w/o Front LiDAR Sensor:

      Body Electrical > Air Conditioner > Active Test 

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Rear Right Seat Heater	Rear right side seat heater operation	OFF/ON	-

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Rear Right Seat Heater

   OK

   Rear right side seat heater operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Replace the air conditioner amplifier assembly with a new one or known good one.

   Refer to REMOVAL [11/2020 - ]

   Result

   Proceed to
   OK

Result: 

OK 

See step  3

1. Check the rear right side seat heater operation.

   Refer to OPERATION CHECK [11/2020 - ]

   OK

   Rear right side seat heater operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE COOLER CONTROL SWITCH ASSEMBLY. Refer to  REMOVAL [11/2020 - ] 

1. Disconnect the M5 seat heater control sub-assembly (rear seat RH) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   M5-1 (+B1) - Body ground	Ignition switch ON	11 to 14 V
   M5-1 (+B1) - Body ground	Ignition switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the D79 air conditioning amplifier assembly connector.
2. Disconnect the M5 seat heater control sub-assembly (rear seat RH) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D79-23 (SM2R) - M5-5 (SWR)	Always	Below 1 Ω
   D79-23 (SM2R) or M5-5 (SWR) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the M6 seatback heater assembly RH connector.
2. Disconnect the M5 seat heater control sub-assembly (rear seat RH) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M6-4 - M5-10(E)	Always	Below 1 Ω
   M6-1 - M5-7(HTR1)	Always	Below 1 Ω
   M6-4 or M5-10 (E) - Body ground	Always	10 kΩ or higher
   M6-1 or M5-7(HTR1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Disconnect the M6 seatback heater assembly RH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M6-5 - Body ground	Always	Below 1 Ω
   M6-5 - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

Refer to INSPECTION [11/2020 - ]

Result

Result: 

NG 

REPLACE SEATBACK HEATER ASSEMBLY RH. Refer to  REMOVAL [11/2020 - ] 

Result: 

OK 

See step  9

Refer to INSPECTION [11/2020 - ]

Result

Result: 

NG 

REPLACE SEAT CUSHION HEATER ASSEMBLY RH. Refer to  REMOVAL [11/2020 - ] 

Result: 

OK 

See step  10

1. Replace the seat heater control sub-assembly (rear seat RH) with a new one or known good one.

   Refer to REMOVAL [11/2020 - ]

   Result

   Proceed to
   OK

Result: 

OK 

See step  11

1. Check the rear right side seat heater operation.

   Refer to OPERATION CHECK [11/2020 - ]

   OK

   Rear right side seat heater operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (SEAT HEATER CONTROL SUB-ASSEMBLY (REAR SEAT RH) WAS DEFECTIVE) 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2020 - ]