Inspection Procedure

NOTE: When using the Techstream with the engine switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR CONDITIONING CONTROL PANEL)

Disconnect the E36 amplifier connector.
Disconnect the E55 and F10* panel connectors.

Measure the resistance and voltage according to the value (s) in the tables below.

HINT:

*: w/o Navigation System

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E36-21 (RLIN) - E55-4 (RLIN)	Always	Below 1 Ω
E36-20 (LIN1) - F10-5 (LIN1)*	Always	Below 1 Ω
E36-21 (RLIN) - Body ground	Always	10 kΩ or higher
E36-20 (LIN1) - Body ground*	Always	10 kΩ or higher

Standard Voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E36-21 (RLIN) - Body ground	Always	Below 1 V
E36-20 (LIN1) - Body ground*	Always	Below 1 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying E36 Amplifier & E55 & F10 Panel Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK REAR AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND)

Disconnect the E55 panel connector.
Measure the resistance and voltage according to the value (s) in the tables below.
Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E55-1 (E) - Body ground	Always	Below 1 Ω

Standard Voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E55-6 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

Fig 2: Identifying E55 Panel Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK REAR AIR CONDITIONING CONTROL PANEL

Temporarily replace the rear air conditioning control panel with a new or normally functioning one (See REAR COOLER CONTROL PANEL ).
Check that the rear air conditioning function is normal.
OK:

Rear air conditioning function is normal.

Result

RESULT REFERENCE

Result	Proceed To
OK	A
NG (w/Navigation System)	B
NG (w/o Navigation System)	C

B: Go to step 4

C: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

A: END (REAR AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)

CHECK FRONT AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND)

Disconnect the F10 panel connector.
Measure the resistance and voltage according to the value (s) in the table below.
Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
F10-1 (GND) - Body ground	Always	Below 1 Ω

Standard Voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
F10-7 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V

Fig 3: Identifying F10 Front Air Conditioning Control Panel Connector

NG: REPLACE FRONT AIR CONDITIONING CONTROL PANEL (See REMOVAL )

OK: Go to Next Step

CHECK FRONT AIR CONDITIONING CONTROL PANEL
1. Temporarily replace the front air conditioning control panel with a new or normally functioning one (See REMOVAL ).
2. Check that the front air conditioning function is normal.
  OK:
  
  Front air conditioning function is normal.
NG: REPLACE AIR CONDITIONING AMPLIFIER (Seepage AC-341)

OK: END (FRONT AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)