Inspection Procedure

Total OBD & ECU Auto Diagnostics

TOAD Auto Software

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READ VALUE OF INTELLIGENT TESTER

MAIN BODY (MAIN BODY ECU):

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

(c) Select the items below in the DATA LIST, and read the display on the intelligent tester.

Item

Measurement Item / Display (Range)

Normal Condition

Diagnostic Note

DIMMER SW

Dimmer switch HIGH signal / ON or OFF

ON: Dimmer switch in HIGH or FLASH

OFF: Dimmer switch in neither HIGH nor FLASH

-

HIGH FLASHER SW

Dimmer switch FLASH signal / ON or OFF

ON: Dimmer switch in FLASH OFF: Dimmer switch not in FLASH

-

F FOG LIGHT SW

Front fog light switch signal / ON or OFF

ON: Fog light switch ON OFF: Fog light switch OFF

-

AUTO LIGHT SW

Light control switch AUTO signal / ON or OFF

ON: Light control switch in AUTO OFF: Light control switch not in AUTO

-

HEAD LIGHT SW

Light control switch HEAD signal / ON or OFF

ON: Light control switch in HEAD OFF: Light control switch not in HEAD

-

TAIL LIGHT SW

Light control switch TAIL signal / ON or OFF

ON: Light control switch in TAIL or HEAD

OFF: Light control switch in neither TAIL nor HEAD

-

Normal conditions listed above are displayed.

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

(a) Inspect the headlight dimmer switch assembly (See page LI-120). OK:

Headlight dimmer switch assembly is normal.

REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - SWITCH ASSEMBLY)

Wire Harness Side:

Headlight Dimmer Switch Assembly BFG T

LFG-HU-

EL HL HF A Main Body ECU

181!

11112

1516

A TAIL

Main Body ECU

1617

FFOG

HEAD

Instrument Panel J/B Assembly

1

2

3

4

5'

6

8

7

9

10

11

(a) Disconnect the E21 headlight dimmer switch assembly connector.

(b) Disconnect the E6 and E7 main body ECU connectors.

(c) Disconnect the IG instrument panel J/B connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection

Condition

Specified Condition

E21-3 (LFG) - E21-16 (HL)

Always

Below 1 Q

E21-4 (BFG) - E6-28 (FFOG)

Always

Below 1 Q

E21-11 (HU) - IG-5 (HU)

Always

Below 1 Q

E21-17 (HF) - E7-13 (HF)

Always

Below 1 Q

E21-18 (T) - E7-23 (TAIL)

Always

Below 1 Q

E21-19 (A) - E7-21 (A)

Always

Below 1 Q

E21-20 (H) - E6-17 (HEAD)

Always

Below 1 Q

E21-3 (LFG) - Body ground

Always

10 kQ or higher

E21-4 (BFG) - Body ground

Always

10 kQ or higher

E21-11 (HU) - Body ground

Always

10 kQ or higher

E21-17 (HF) - Body ground

Always

10 kQ or higher

E21-18 (T) - Body ground

Always

10 kQ or higher

E21-19 (A) - Body ground

Always

10 kQ or higher

E21-20 (H) - Body ground

Always

10 kQ or higher

E21-12 (EL) - Body ground

Always

Below 1 Q

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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