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Climate Control Seat System (Diagnostics): Overview Lexus GS III facelift

Seats 17 illustrations ~1541 words

SYSTEM DESCRIPTION

  1. GENERAL The blower volume has 4 levels controlled by operating the dial-type climate control seat switch, which is located in the console box. Whether the blower is ON or OFF can be determined by checking if the climate control seat switch indicator light is ON or OFF. The blowers of both seats are controlled by the air conditioning amplifier assembly (A/C ECU).

DESCRIPTION

The A/C amplifier assembly receives seat heater switch position signals when the engine switch is on (IG), and then transmits airflow amount signals to each seat climate blower.

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Scheme 151: WIRING DIAGRAM
Scheme 151: WIRING DIAGRAM

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Scheme 152: PROCEDURE
Scheme 152: PROCEDURE

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  1. SYSTEM CHECK Check the climate control seat operation. Result Result Proceed to Climate control seat does not operate (Front LH) A Climate control seat does not operate (Front RH) B Both climate control seats do not operate C C --> See step 18 B --> See step 10 A: Go to next step
  2. SYSTEM CHECK Check the climate control operation again. Result Result Proceed to Only seat back climate control blower LH does not operate A Both climate control blower do not operate B B --> See step 5 A: Go to next step
  3. CHECK HARNESS AND CONNECTOR Disconnect the b14 connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition b14-2 (IG) - b14-1 (GND) Engine switch on (IG) Blower switch ON (Vol: 1 to 3) 6.7 to 9.3 V NG --> See step 4 OK --> See step 20
  4. CHECK HARNESS AND CONNECTOR Disconnect the b11 connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition b14-2 (IG) - b11-2 (CTB) Always Below 1 ohms b14-2 (IG) - Body ground Always Below 1 ohms b14-1 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 21
  5. CHECK HARNESS AND CONNECTOR Disconnect the b11 connector. Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage and Resistance Tester Connection Condition Specified Condition b11-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V b11-4 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  6. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY Reconnect the b11 connector. Check the input signal waveform. Connect the oscilloscope to terminal 3 and body ground with the climate control blower LH connector still connected. Check the signal waveform according to the condition(s) in the table below. Terminal No. b11-3 (SIGN) - Body ground Tool Setting 2 V/DIV., 500 μsec./DIV. Vehicle Condition Engine switch on (IG), seat hater switch ON NG --> See step 7 OK --> See step 22
  7. CHECK HARNESS AND CONNECTOR Disconnect the b11 and K51 connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition b11-3 (SIGN) - J59-16 (LOUT) Always Below 1 ohms b11-3 (SIGN) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  8. INSPECT SEAT HEATER SWITCH Remove the seat heater switch. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kohms or higher K40-7 (BLLH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kohms K40-7 (BLLH) - K40-10 (SVSG) Blower switch ON (Vol: 3) Below 111 ohms NG --> REPLACE SEAT HEATER SWITCH OK: Go to next step
  9. CHECK HARNESS AND CONNECTOR Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K40-7(BLLH) - K51-2 (SW 5) Always Below 1 ohms K40-8 (SVS5) - K51-7 (S5-4) Always Below 1 ohms K40-10 (SVSG) - K51-10 (SG-4) Always Below 1 ohms K40-12 (E) - Body ground Always Below 1 ohms K40-7 (BLLH) - Body ground Always 10 kohms or higher K40-8 (SVS5) - Body ground Always 10 kohms or higher K40-10 (SVSG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 23
  10. SYSTEM CHECK Check the climate control operation again. Result Result Proceed to Only seat back climate control blower RH does not operate A Both climate control blower do not operate B B --> See step 13 A: Go to next step
  11. CHECK HARNESS AND CONNECTOR Disconnect the a14 connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition a14-2 (IG) - a14-1 (GND) Engine switch on (IG) Blower switch ON (Vol: 1 to 3) 6.7 to 9.3 V NG --> See step 12 OK --> See step 24
  12. CHECK HARNESS AND CONNECTOR Disconnect the a11 connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a14-2 (IG) - a11-2 (CTB) Always Below 1 ohms a14-2 (IG) - Body ground Always Below 1 ohms a14-1 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 25
  13. CHECK HARNESS AND CONNECTOR Disconnect the a11 connector. Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage and Resistance Tester Connection Condition Specified Condition a11-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V a11-4 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  14. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY Reconnect the a11 connector. Check the input signal waveform. Connect the oscilloscope to terminal 3 and body ground with the climate control blower RH connector still connected. Check the signal waveform according to the condition(s) in the table below. Terminal No. a11-3 (SIGN) - Body ground Tool Setting 2 V/DIV., 500 μsec./DIV. Vehicle Condition Engine switch on (IG), seat hater switch ON NG --> See step 15 OK --> See step 26
  15. CHECK HARNESS AND CONNECTOR Disconnect the a11 and K51 connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a11-3 (SIGN) - J59-8 (ROUT) Always Below 1 ohms a11-3 (SIGN) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  16. INSPECT SEAT HEATER SWITCH Remove the seat heater switch. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kohms K40-9 (BLRH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kohms K40-9 (BLRH) - K40-10 (SVSG) Blower switch ON (Vol: 3) Below 111 ohms NG --> REPLACE SEAT HEATER SWITCH OK: Go to next step
  17. CHECK HARNESS AND CONNECTOR Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K40-9(BLRH) - K51-3 (SW 4) Always Below 1 ohms K40-8 (SVS5) - K51-7 (S5-4) Always Below 1 ohms K40-10 (SVSG) - K51-10 (SG-4) Always Below 1 ohms K40-12 (E) - Body ground Always Below 1 ohms K40-9 (BLRH) - Body ground Always 10 kohms or higher K40-8 (SVS5) - Body ground Always 10 kohms or higher K40-10 (SVSG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 27
  18. INSPECT SEAT HEATER SWITCH Remove the seat heater switch. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kohms K40-9 (BLRH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kohms K40-9 (BLRH) - K40-10 (SVSG) Blower switch ON (Vol: 3) Below 111 ohms K40-8 (SVS5) - K40-10 (SVSG) Always Below 1 kohms K40-7 (BLLH) - K40-10 (SVSG) Blower switch OFF Below 1.1 kohms K40-7 (BLLH) - K40-10 (SVSG) Blower switch ON (Vol. 3) Below 111 ohms NG --> REPLACE SEAT HEATER SWITCH OK: Go to next step
  19. CHECK HARNESS AND CONNECTOR Disconnect the K51 connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K40-8 (SVS5) - K51-7 (S5-4) Always Below 1 ohms K40-10 (SVSG) - K51-10 (SG-4) Always Below 1 ohms K40-8 (SVS5) - Body ground Always 10 kohms or higher K40-10 (SVSG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 28
  20. REPLACE SEAT BACK CLIMATE CONTROL BLOWER LH. Refer to «DISASSEMBLY - Step 23»(ref-382755-S40575813342011012800000)
  21. REPLACE SEAT CLIMATE CONTROL BLOWER LH. Refer to «DISASSEMBLY - Step 25»(ref-382755-S40575813342011012800000)
  22. REPLACE SEAT CLIMATE CONTROL BLOWER LH. Refer to «DISASSEMBLY - Step 25»(ref-382755-S40575813342011012800000)
  23. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-382722-S02196590542011012800000)
  24. REPLACE SEAT BACK CLIMATE CONTROL BLOWER RH. Refer to «DISASSEMBLY - Step 23»(ref-382755-S40575813342011012800000)
  25. REPLACE SEAT CLIMATE CONTROL BLOWER RH. Refer to «DISASSEMBLY - Step 25»(ref-382755-S40575813342011012800000)
  26. REPLACE SEAT CLIMATE CONTROL BLOWER RH. Refer to «DISASSEMBLY - Step 25»(ref-382755-S40575813342011012800000)
  27. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-382722-S02196590542011012800000)
  28. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-382722-S02196590542011012800000)

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