How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use the following procedure to troubleshoot the air conditioning system
*: Use the Techstream.

VEHICLE BROUGHT TO WORKSHOP
INSPECT BATTERY VOLTAGE
1. Inspect the battery voltage.
  Standard Voltage:
  
  11 to 14 V
  
  If the voltage is below 11V, recharge or replace the battery before proceeding.

CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)*

Use the Techstream to check if the Multiplex Communication System (MPX) is functioning normally

Result

RESULT DESCRIPTION

Result	Proceed to
MPX DTC is not output	A
MPX DTC is output	B

B: Go to MULTIPLEX COMMUNICATION SYSTEM

A: Go to next step

CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

Use the Techstream to check if the CAN Communication System is functioning normally.

Result

RESULT DESCRIPTION

Result	Proceed to
CAN DTC is not output	A
CAN DTC is output	B

B: Go to CAN COMMUNICATION SYSTEM

A: Go to next step

CHECK FOR DTC*

Check for DTCs and note any codes that are output.
Clear the DTCs.

Recheck for DTCs Based on the DTCs output above, try to force output of the A/C system DTC by simulating the operation indicated by the DTC

Result

RESULT DESCRIPTION

Result	Proceed to
DTC is not output	A
DTC is output	B

B: Go to step 8

A: Go to next step

PROBLEM SYMPTOMS TABLE

Refer to PROBLEM SYMPTOMS TABLE .

Result

RESULT DESCRIPTION

Result	Proceed to
Fault is not listed in problem symptoms table	A
Fault is listed in problem symptoms table	B

B: Go to step 8

A: Go to next step

OVERALL ANALYSIS AND TROUBLESHOOTING*
1. Actuator Check (See ACTUATOR CHECK )
2. Data List / Active Test (See DATA LIST / ACTIVE TEST )
3. Terminals of ECU (See TERMINALS OF ECU )
4. On-vehicle Inspection
5. Inspection
ADJUST, REPAIR OR REPLACE
NEXT: END