Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Rear Heater Control Panel LIN Communication Malfunction: Procedure
- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH)
- Disconnect the L76 amplifier connector.
- Disconnect the r2*1 or S15*2 module switch connector.
HINT:
*1: except 4-Passenger with Ottoman
*2: for 4-Passenger with Ottoman
- Measure the resistance and voltage according to the value(s) in the table below.
Standard resistance
EXCEPT 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition L76-21 (LIN3) - r2-14 (RCLN) Always Below 1 Ω L76-21 (LIN3) or r2-14 (RCLN) - Body ground Always 10 kΩ or higher FOR 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition L76-21 (LIN3) - S15-13 (RCLN) Always Below 1 Ω L76-21 (LIN3) or S15-13 (RCLN) - Body ground Always 10 kΩ or higher Standard voltage
EXCEPT 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition L76-21 (LIN3) or r2-14 (RCLN) - Body ground Always Below 1 V FOR 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition L76-21 (LIN3) or S15-13 (RCLN) - Body ground Always Below 1 V
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK REAR POWER SEAT MODULE SWITCH (BATTERY VOLTAGE AND GROUND)
- Disconnect the r2*1 or S15*2 module switch connector.
HINT:
*1: except 4-Passenger with Ottoman
*2: for 4-Passenger with Ottoman
- Measure the resistance and voltage according to the value(s) in the table below.
Standard resistance
EXCEPT 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition r2-3 (E) - Body ground Always Below 1 Ω FOR 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition S15-5 (E) - Body ground Always Below 1 Ω Standard voltage
EXCEPT 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition r2-11 (B) - Body ground Always 11 to 14 V FOR 4-PASSENGER WITH OTTOMAN:Tester Connection Condition Specified Condition S15-6 (B) - Body ground Always 11 to 14 V
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- Disconnect the r2*1 or S15*2 module switch connector.
- REPLACE REAR POWER SEAT MODULE SWITCH (OPERATION)
- Temporarily replace the rear power seat module switch with a new or normally functioning one.
- except Ottoman: Refer to DISASSEMBLY
- for Ottoman: Refer to DISASSEMBLY
- Check the rear air conditioning function is normal.
OK
Rear air conditioning function is normal.
NG → See step 4
OK → END (REAR POWER SEAT MODULE SWITCH IS DEFECTIVE)
- Temporarily replace the rear power seat module switch with a new or normally functioning one.
- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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