ALL SWITCH/DIAL OPERATION DOES NOT RESPOND (REAR CLIMATE CONTROL UNIT) [FULL-AUTO AIR CONDITIONER]
id0703c1006800
DESCRIPTION
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• All switch operation of rear climate control unit does not respond
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POSSIBLE CAUSE
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• Open circuit or short to ground in wiring harness between rear climate control unit terminal B and front body control module (FBCM) terminal 1C
• Open circuit or short to power supply in wiring harness between rear climate control unit terminal R and body ground
• Ground point floating, bad contact
• Rear climate control unit malfunction
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Diagnostic Procedure
Step |
Inspection |
Action |
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1*
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INSPECT REAR CLIMATE CONTROL UNIT IG2 SIGNAL
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminals (wiring harness-side):
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between rear climate control unit terminal and front body control module (FBCM) terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness.
Go to Step 3.
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2*
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INSPECT REAR CLIMATE CONTROL UNIT GND SIGNAL
• Measure the voltage at the following terminals (wiring harness-side):
• Is the voltage 0 V?
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Yes
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Replace the rear climate control unit, then go to the next step.
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No
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Refer to the wiring diagram and verify if there is a common connector between the rear climate control unit terminal and ground point.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness.
Go to the next step.
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3
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VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
• Do the related parts operate according to the switch operation of the rear climate control unit?
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Yes
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Troubleshooting completed.
Explain repairs to customer.
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No
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Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
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