Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HEATER CONTROL HOUSING SUB-ASSY(SPD)
1. Remove A/C amplifier with connectors still connected.
2. Shift the shift lever to neutral.
3. Lift up the vehicle.
4. Turn the ignition switch ON.
5. Measure voltage between terminal SPD of the A/C amplifier connector and body ground when the front wheel is turned slowly.
  Voltage is generated intermittently:
  
  Fig 1: Measuring Voltage Between Terminal SPD Of A/C Amplifier Connector And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )

NG: Go to next step.

Voltage

Fig 2: Identifying Graphic Of Voltage Generated Intermittently
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK COMBINATION METER ASSY
1. Remove combination meter with connector.
2. Shift the shift lever to neutral.
3. Lift up the vehicle.
4. Turn the ignition switch ON.
5. Measure voltage between terminal C7-33 of the combination meter and body ground when the front wheel is turned slowly.
  Voltage is generated intermittently:
  
  Fig 3: Measuring Voltage Between Terminal C7-33 Of Combination Meter And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Identifying Graphic Of Voltage Generated Intermittently
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: GO TO COMBINATION METER SYSTEM

OK: Go to next step.
CHECK HARNESS AND CONNECTOR(BETWEEN COMBINATION METER AND A/C AMPLIFIER)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )