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INSPECTION PROCEDURE 10: Blower motor power supply system
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the blower motor is not energized, the blower relay system is suspected.
 
 
 
TROUBLESHOOTING HINTS
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
  • Malfunction of the ETACS-ECU
 
 
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Measure the voltage at blower relay connector.
(1) Remove the relay, and measure at the ETACS-ECU side.
(2) Voltage between power supply terminal and body ground
OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 3.
Go to Step 2.
 
STEP 2. Check of open circuit in blower relay power supply line between blower relay connector and fusible link (5).
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
 
STEP 3. Check of open circuit in HTR line between blower motor connector terminal and blower relay connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Retest the system.
Check that the blower motor is energized.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).