Lexus SC300 / Lexus SC400. Manual — part 19

STANDARD VALUE OF ECU TERMINAL (Cont’d)

AC–34

–

AIR CONDITIONING SYSTEM

Troubleshooting

WIRING DIAGRAM

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AIR CONDITIONING SYSTEM

Troubleshooting

AC–35

AC–44

AC–46

AC–48

AC–50

AC–52

AC–54

AC–56

AC–58

AC–60

AC–62

AC–64

AC–66

MATRIX CHART OF PROBLEM SYMPTOMS

If a normal code is displayed during the diagnostic code check (sensor check) but the trouble still occurs (reap-
pears), perform out troubleshooting for each problem symptom, checking the circuits for each symptom in the
order given in the table below (Proceed to the page given for each circuit).

AC–36

–

AIR CONDITIONING SYSTEM

Troubleshooting

AC–68

AC–70

AC–72

AC–74

AC–76

AC–78

AC–80

AC–82

AC–84

AC–90

AC–92

AC–96

AC–98

AC–10

8

IN–32

AC–100

AC–103

AC–10

4

AC–12

0

AC–1

18

AC–122

AC–12

5

AC–126

HINT:

•

If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart for each
circuit, proceed to the circuit with the next highest number in the table to continue the check.

•

If the trouble still reappears even though there are no abnormalities in any of the other circuits, then check
or replace the air conditioner control assembly (contains the ECU).

–

AIR CONDITIONING SYSTEM

Troubleshooting

AC–37