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Contents Wiring diagrams Section: Automatic HVAC System All sections

Air Conditioning System (Diagnostic Codes & Circuit Tests): Other Lexus GX J150

Automatic HVAC System ~3395 words

PROCEDURE

  1. READ VALUE USING TECHSTREAM (FRONT PASSENGER SIDE AIR MIX DAMPER SERVO) Use the Data List to check if the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) is functioning properly. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Air Mix Servo Targ Pulse (P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) target pulse / Min.: 0, Max.: 255 112 or 127 (pulse): MAX COOL 21 or 31 (pulse): MAX HOT - Air Mix Servo Actual Pulse (P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) actual pulse / Min.: 0, Max.: 255 112 or 127 (pulse): MAX COOL 21 or 31 (pulse): MAX HOT - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK (When troubleshooting according to problem symptoms table) A OK (When troubleshooting according to the DTC) B NG C B --> See step 9 C --> See step 2 A --> See step 10
  2. PERFORM ACTIVE TEST USING TECHSTREAM (FRONT PASSENGER SIDE AIR MIX DAMPER SERVO) Select the Active Test, use the Techstream to generate a control command, and then check that the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) operates. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Air Mix Servo Targ Pulse (P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) pulse Min.: 0, Max.: 255 - OK No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) operates normally. NG --> See step 3 OK --> See step 7
  3. REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE AIR MIX DAMPER SERVO) Replace the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo). Refer to «DISASSEMBLY»(ref-524260-S09285825982013012800000) . HINT: Since the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 2 air conditioning radiator damper servo sub-assembly (front passenger side air mix damper servo) with a new or normally functioning one. NEXT: Go to next step
  4. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1441 is not output. NG --> See step 5 OK --> END (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [FRONT PASSENGER SIDE AIR MIX DAMPER SERVO] IS FAULTY)
  5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one. Refer to «REMOVAL»(ref-524260-S29534205702013012800000) . NEXT: Go to next step
  6. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1441 is not output. NG --> See step 8 OK --> END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)
  7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  8. REPLACE AIR CONDITIONING HARNESS ASSEMBLY. Refer to «DISASSEMBLY»(ref-524260-S09285825982013012800000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  10. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524121-S04171627272013012800000)
  1. READ VALUE USING TECHSTREAM (RECIRCULATION DAMPER SERVO) Use the Data List to check if the recirculation damper servo sub-assembly is functioning properly. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse / Min.: 0, Max.: 255 7 (pulse): Recirculation 28 (pulse): Fresh - Air Inlet Damper Actual Pulse Recirculation damper servo sub-assembly actual pulse / Min.: 0, Max.: 255 7 (pulse): Recirculation 28 (pulse): Fresh - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK (When troubleshooting according to problem symptoms table) A OK (When troubleshooting according to the DTC) B NG C B --> See step 9 C --> See step 2 A --> See step 10
  2. PERFORM ACTIVE TEST USING TECHSTREAM (RECIRCULATION DAMPER SERVO) Select the Active Test, use the Techstream to generate a control command, and then check that the recirculation damper servo sub-assembly operates. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse Min.: 0, Max.: 255 - OK Recirculation damper servo sub-assembly operates normally. NG --> See step 3 OK --> See step 7
  3. REPLACE RECIRCULATION DAMPER SERVO SUB-ASSEMBLY Replace the recirculation damper servo sub-assembly. Refer to «DISASSEMBLY»(ref-524260-S17793637662013012800000) . HINT: Since the recirculation damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the recirculation damper servo sub-assembly with a new or normally functioning one. NEXT: Go to next step
  4. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1442 is not output. NG --> See step 5 OK --> END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY IS FAULTY)
  5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one. Refer to «REMOVAL»(ref-524260-S29534205702013012800000) . NEXT: Go to next step
  6. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1442 is not output. NG --> See step 8 OK --> END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)
  7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  8. REPLACE AIR CONDITIONING HARNESS ASSEMBLY. Refer to «DISASSEMBLY»(ref-524260-S09285825982013012800000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  10. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524121-S04171627272013012800000)
  1. READ VALUE USING TECHSTREAM (MODE DAMPER SERVO) Use the Data List to check if the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) is functioning properly. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) actual pulse / Min.: 0, Max.: 255 15 (pulse): FACE 1 23 (pulse): FACE 2 41 (pulse): B/L 65 or 73 (pulse): FOOT 83 or 95 (pulse): F/D 113 (pulse): DEF - Air Outlet Servo Actu Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) actual pulse / Min.: 0, Max.: 255 15 (pulse): FACE 1 23 (pulse): FACE 2 41 (pulse): B/L 65 or 73 (pulse): FOOT 83 or 95 (pulse): F/D 113 (pulse): DEF - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK (When troubleshooting according to problem symptoms table) A OK (When troubleshooting according to the DTC) B NG C B --> See step 9 C --> See step 2 A --> See step 10
  2. PERFORM ACTIVE TEST USING TECHSTREAM (MODE DAMPER SERVO) Select the Active Test, use the Techstream to generate a control command, and then check that the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) operates. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) pulse Min.: 0, Max.: 255 - OK No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) operates normally. NG --> See step 3 OK --> See step 7
  3. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO) Replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo). Refer to «DISASSEMBLY»(ref-524260-S09285825982013012800000) . HINT: Since the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) with a new or normally functioning one. NEXT: Go to next step
  4. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1443 is not output. NG --> See step 5 OK --> END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [MODE DAMPER SERVO] IS FAULTY)
  5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one. Refer to «REMOVAL»(ref-524260-S29534205702013012800000) . NEXT: Go to next step
  6. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1443 is not output. NG --> See step 8 OK --> END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)
  7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  8. REPLACE AIR CONDITIONING HARNESS ASSEMBLY. Refer to «DISASSEMBLY»(ref-524260-S09285825982013012800000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  10. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524121-S04171627272013012800000)
  1. READ VALUE USING TECHSTREAM (DRIVER SIDE AIR MIX DAMPER SERVO) Use the Data List to check if the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) is functioning properly. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Air Mix Servo Targ Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) target pulse / Min.: 0, Max.: 255 107 (pulse): MAX COOL 26 (pulse): MAX HOT - Air Mix Servo Actual Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) actual pulse / Min.: 0, Max.: 255 107 (pulse): MAX COOL 26 (pulse): MAX HOT - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK (When troubleshooting according to problem symptoms table) A OK (When troubleshooting according to the DTC) B NG C B --> See step 9 C --> See step 2 A --> See step 10
  2. PERFORM ACTIVE TEST USING TECHSTREAM (DRIVER SIDE AIR MIX DAMPER SERVO) Select the Active Test, use the Techstream to generate a control command, and then check that the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) operates. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Air Mix Servo Targ Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) target pulse Min.: 0, Max.: 255 - OK No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) operates normally. NG --> See step 3 OK --> See step 7
  3. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DRIVER SIDE AIR MIX DAMPER SERVO) Replace the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo). Refer to «DISASSEMBLY»(ref-524260-S09285825982013012800000) . HINT: Since the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix damper servo) with a new or normally functioning one. NEXT: Go to next step
  4. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1446 is not output. NG --> See step 5 OK --> END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [DRIVER SIDE AIR MIX DAMPER SERVO] IS FAULTY)
  5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one. Refer to «REMOVAL»(ref-524260-S29534205702013012800000) . NEXT: Go to next step
  6. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1446 is not output. NG --> See step 8 OK --> END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)
  7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  8. REPLACE AIR CONDITIONING HARNESS ASSEMBLY. Refer to «DISASSEMBLY»(ref-524260-S09285825982013012800000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  10. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524121-S04171627272013012800000)
  1. READ VALUE USING TECHSTREAM (REAR AIR MIX DAMPER SERVO) Use the Data List to check if the rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) is functioning properly. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Air Mix Servo Targ Pulse (R) Rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) target pulse / Min.: 0, Max.: 255 9 (pulse): MAX COOL 54 (pulse): MAX HOT - Air Mix Servo Actual Pulse (R) Rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) actual pulse / Min.: 0, Max.: 255 9 (pulse): MAX COOL 54 (pulse): MAX HOT - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK (When troubleshooting according to problem symptoms table) A OK (When troubleshooting according to the DTC) B NG C B --> See step 9 C --> See step 2 A --> See step 8
  2. PERFORM ACTIVE TEST USING TECHSTREAM (REAR AIR MIX DAMPER SERVO) Select the Active Test, use the Techstream to generate a control command, and then check that the rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) operates. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Rear Air Mix Servo Targ Pulse Rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) target pulse Min.: 0, Max.: 255 - OK Rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) operates normally. NG --> See step 3 OK --> See step 9
  3. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER) Disconnect the Q13 harness connector. Disconnect the G12 amplifier connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Q13-3 (RBUS) - G12-1 (RBUS) Always Below 1 ohms Q13-4 (RBBU) - G12-23 (RBBU) Always Below 1 ohms Q13-2 (RBUG) - G12-21 (RBUG) Always Below 1 ohms G12-1 (RBUS) - Body ground Always 10 kohms or higher G12-23 (RBBU) - Body ground Always 10 kohms or higher G12-21 (RBUG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. REPLACE REAR NO. 1 COOLING UNIT DAMPER SERVO SUB-ASSEMBLY (REAR AIR MIX DAMPER SERVO) Replace the rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo). Refer to «DISASSEMBLY»(ref-524260-S04204700692013012800000) . HINT: Since the rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the rear No. 1 cooling unit damper servo sub-assembly (rear air mix damper servo) with a new or normally functioning one. NEXT: Go to next step
  5. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1447 is not output. NG --> See step 6 OK --> END (REAR NO. 1 COOLING UNIT DAMPER SERVO SUB-ASSEMBLY [REAR AIR MIX DAMPER SERVO] IS FAULTY
  6. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one. Refer to «REMOVAL»(ref-524260-S29534205702013012800000) . NEXT: Go to next step
  7. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1447 is not output. NG --> See step 10 OK --> END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)
  8. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524121-S04171627272013012800000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  10. REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY. Refer to «DISASSEMBLY»(ref-524260-S04204700692013012800000)
  1. READ VALUE USING TECHSTREAM (REAR MODE DAMPER SERVO) Use the Data List to check if the rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) is functioning properly. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Air Outlet Servo Pulse (R) Rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) target pulse / Min.: 0, Max.: 255 83 (pulse): FACE 41 (pulse): B/L 7 (pulse): FOOT - Air Mix Servo Actual Pulse (R) Rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) actual pulse / Min.: 0, Max.: 255 83 (pulse): FACE 41 (pulse): B/L 7 (pulse): FOOT - OK The display is as specified in the normal condition column. RESULT Result Proceed to OK (When troubleshooting according to problem symptoms table) A OK (When troubleshooting according to the DTC) B NG C B --> See step 9 C --> See step 2 A --> See step 8
  2. PERFORM ACTIVE TEST USING TECHSTREAM (REAR MODE DAMPER SERVO) Select the Active Test, use the Techstream to generate a control command, and then check that the rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) operates. Refer to «DATA LIST / ACTIVE TEST»(ref-524121-S13390577292013012800000) . AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note A/O Servo Pulse (Rr D) Rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) pulse Min.: 0, Max.: 255 - OK Rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) operates normally. NG --> See step 3 OK --> See step 9
  3. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER) Disconnect the Q13 harness connector. Disconnect the G12 amplifier connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Q13-3 (RBUS) - G12-1 (RBUS) Always Below 1 ohms Q13-4 (RBBU) - G12-23 (RBBU) Always Below 1 ohms Q13-2 (RBUG) - G12-21 (RBUG) Always Below 1 ohms G12-1 (RBUS) - Body ground Always 10 kohms or higher G12-23 (RBBU) - Body ground Always 10 kohms or higher G12-21 (RBUG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. REPLACE REAR NO. 2 COOLING UNIT DAMPER SERVO SUB-ASSEMBLY (REAR MODE DAMPER SERVO) Replace the rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo). Refer to «DISASSEMBLY»(ref-524260-S04204700692013012800000) . HINT: Since the rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) cannot be inspected while it is removed from the vehicle, replace the rear No. 2 cooling unit damper servo sub-assembly (rear mode damper servo) with a new or normally functioning one. NEXT: Go to next step
  5. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1449 is not output. NG --> See step 6 OK --> END (REAR NO. 2 COOLING UNIT DAMPER SERVO SUB-ASSEMBLY [REAR MODE DAMPER SERVO] IS FAULTY
  6. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one. Refer to «REMOVAL»(ref-524260-S29534205702013012800000) . NEXT: Go to next step
  7. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-524121-S36455431922013012800000) . OK DTC B1449 is not output. NG --> See step 10 OK --> END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)
  8. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-524121-S04171627272013012800000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-524260-S29534205702013012800000)
  10. REPLACE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY. Refer to «DISASSEMBLY»(ref-524260-S04204700692013012800000)
  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Use the Techstream to check if the CAN communication system is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-524289-S06634024762013012800000) . RESULT Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 2 A --> See step 3
  2. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-524289-S06634024762013012800000)
  3. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-524109-S12033069852013012800000)

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