Isuzu Rodeo UE. Service manual - part 567

8D–116

WIRING SYSTEM

Circuit Diagram

D08RX121

8D–117

WIRING SYSTEM

Parts Location

D08RX120

Legend

(1) H–14
(2) I–41, I–42
(3) Alarm & Relay Control Unit
(4) Horn Switch

(5) I–32
(6) Horn (Low note)
(7) C–14
(8) C–12
(9) Horn (High note)

8D–118

WIRING SYSTEM

Diagnosis

Horn Do Not Sound

Step

Action

Value(s)

Yes

No

1

Is the fuse 2 normal?

—

Go to Step 2

Replace the

fuse

2

Remove the horn relay.

Is the battery voltage applied between horn relay
harness side connector I–41 terminal 2 or connector
I–42 terminal 2 and the ground?

Approx. 12V

Go to Step 4

Go to Step 3

3

Repair an open circuit between the fuse 2 and
connector I–41 terminal 2 or connector I–42 terminal 2.

Is the action complete?

—

Go to Step 2

—

4

Connect the battery positive terminal with the horn
relay side connector I–41 terminal 2 or connector I–42
terminal 2 and the negative terminal with connector
I–42 terminal 20 or 15.

Is there continuity between horn relay side connector
I–41 terminal 2 and 1 or connector I–42 terminal 2 and
connector I–41 terminal 4?

—

Go to Step 5

Replace the

relay

5

1. Disconnect the horn switch connector I–49.
2. Press the horn switch.

Is there continuity between the switch side connector
I–49 terminal 1 and the ground?

—

Go to Step 6

Repair or

replace the

switch

6

Is there continuity between harness side connector
I–42 terminal 20 or 15 and harness side connector I–49
terminal 1?

—

Go to Step 8

Go to Step 7

7

Repair an open circuit between connector I–42
terminal 20 or 15 and connector I–49 terminal 1.

Is the action complete?

—

Verify repair

—

8

Repair an open circuit between the horn relay and the
horns.

Is the action complete?

—

Verify repair

—

Horn Do Not Shut Off

Step

Action

Value(s)

Yes

No

1

Disconnect the horn connector C–12 or C–14.

Is the battery voltage applied between harness side
connector C–12 or C–14 terminal 1 and the ground?

Approx. 0V

Replace the

relay

Go to Step 2

2

Disconnect the horn switch connector I–49.

Is there continuity between switch side connector I–49
terminal 1 and the ground?

—

Repair or

replace the

switch

Go to Step 3

3

Repair a short circuit between the horn relay and the
horn switch.

Is the action complete?

—

Verify repair

—

8D–119

WIRING SYSTEM

Dome Light, Luggage Room Light, Courtesy Light, Map Light, Seat

Belt Switch and Warning Buzzer

General Description

The circuit consists of door switch, dome light, luggage
room light, courtesy light, map light seat belt switch, seat
belt warning light, key cylinder switch and alarm & relay
control unit.
Dome light comes on with dome light switch turned to
door position and any door open.
The buzzer sounds when starter switch is turned to either
“ACC” or “OFF” position and FRT door–LH, is opened
with lighting switch on.
The buzzer sounds when FRT door–LH is opened with
starter key left in starter switch key cylinder.
The buzzer also sounds when starter switch is turned to
“ON” position with seat belt unfastened.
These functions are controlled by alarm & relay control
unit.