On-Vehicle Inspection

WARNING: This page is about a different car, the 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

REMOVE A/C CONTROL ASSEMBLY
(See REMOVAL )
INSPECT A/C CONTROL ASSEMBLY CIRCUIT
1. Disconnect the connector from the A/C control assembly and inspect the connector on the wire harness side, as shown in chart.
  
  Fig 1: Identifying A/C Control Assembly Connectors Wire Harness Side
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Test condition:
  
  Turn ignition switch ON
  
  Fig 2: Continuity & Voltage Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the circuit is not as specified, inspect the circuit connected to other parts.
  
  If the circuit is as specified, proceed to INSPECTION .
2. Connect the connector to amplifier and inspect the wire harness side connector from the back side, as shown in the chart.
  Test conditions:
  - Running engine at idle speed
  - Blower speed control dial at "HI" position
  - Temperature control dial at "MAX. COOL" position
  - A/C switch ON
Fig 3: Identifying A/C Control Assembly Connectors Back Side
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Continuity & Voltage Condition Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the circuit is not as specified, proceed to INSPECTION .
INSTALL A/C CONTROL ASSEMBLY
(See INSTALLATION )