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WIRING
Basic Diagnostic Procedure
WIRING SYSTEM

1. Basic Diagnostic Procedure 5) The circuit is in good order. If a problem such as
a light failing to illuminate occurs, use the proce-
A: BASIC PROCEDURES dures outlined above to track down malfunction.
1. GENERAL DESCRIPTION 2. CIRCUIT CONTINUITY CHECKS
The most important purpose of diagnostics is to de- 1) Disconnect the battery terminal or connector so
termine which part is malfunctioning quickly, to there is no voltage between check points.
save time and labor. Contact the two leads of an ohmmeter to each of
the check points.
2. IDENTIFICATION OF TROUBLE SYMP- If the circuit has diodes, reverse the two leads and
TOM check again.
Determine what the problem is based on the symp- 2) Use an ohmmeter to check for the diode continu-
tom. ity. When contacting the negative lead to diode
positive side and positive lead to negative side,
3. PROBABLE CAUSE OF TROUBLE there should be continuity.
Look at the wiring diagram and check system's cir- When contacting the two leads in reverse, there
cuit. Then check the switch, relay, fuse, ground, should be no continuity.
etc.
4. LOCATION AND REPAIR OF TROUBLE
1) Using the diagnostics, narrow down the causes.
2) If necessary, use a voltmeter, ohmmeter, etc.
3) Before replacing certain component parts
(switch, relay, etc.), check the power supply,
ground, for open wiring harness, poor connectors,
etc. If no problems are encountered, check the Continuity No continuity
component parts.
WI-00095
5. CHECK SYSTEM OPERATION
3) Symbol " -- " indicates that continuity exists
After repairing, ensure that the system operates between two points or terminals. For example,
properly. when a switch position is at "3", continuity exists
B: BASIC INSPECTION among terminals 1, 3 and 6, as shown in table be-
low.
1. VOLTAGE MEASUREMENT
Terminal
1) Using a voltmeter, connect the negative lead to a 1 2 3 4 5 6
Switch Position
good ground point or negative battery terminal and
the positive lead to the connector or component ter- OFF
minal. 1
2) Contact the positive lead of the voltmeter on
2
connector (A). The voltmeter will indicate a voltage.
3) Shift the positive lead to connector (B). The volt- 3
meter will indicate no voltage. 4

WI-00096
To power FUSE Switch Light
supply

(A) (B)

WI-00094

4) With the test set-up held as it is, turn the switch
ON. The voltmeter will indicate a voltage and, at the
same time, the light will come on.

WI-3
Basic Diagnostic Procedure
WIRING SYSTEM

3. HOW TO DETERMINE AN OPEN CIR- 4. HOW TO DETERMINE A SHORT CIR-
CUIT CUIT
1) WITH VOLTMETER: 1) WITH TEST LIGHT:
An open circuit is determined by measuring the Connect a test light (rated at approx. 3 watts) in
voltage between respective connectors and ground place of the blown fuse and allow current to flow
using a voltmeter, starting with the connector clos- through the circuit. Disconnect one connector at a
est to power supply. The power supply must be time from the circuit, starting with the one located
turned ON so that current flows in the circuit. If volt- farthest from power supply. If the test light goes out
age is not present between a particular connector when a connector is disconnected, the wiring be-
and ground, the circuit between that connector and tween that connector and next connector (farther
previous connector is open. from the power supply) is shorted.

Open circuit or wiring Test lamp

Shorted wiring

V V Fuse holder

No voltage is present

Voltage is present
WI-00097 WI-00099

2) WITH OHMMETER: 2) WITH OHMMETER:
Disconnect all connectors affected, and check the Disconnect all affected connectors, and check the
continuity in wiring between adjacent connectors. continuity between each connector and ground.
When the ohmmeter indicates "infinite", the wiring When the ohmmeter indicates continuity between a
is open. particular connector and a ground, that the connec-
tor is shorted.
Open circuit

Shorted connector

Continuity exists.
Continuity does not exist.
WI-09860
WI-00100

WI-4
Basic Diagnostic Procedure
WIRING SYSTEM

C: HOW TO READ WIRING DIAGRAMS
1. WIRING DIAGRAM
The wiring diagram of each system is illustrated so that you can understand the path through which electric
current flows from battery.
Sketches and codes are used in the diagrams. They should read as follows:

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