Bulb Check - Toyota Automobile Electrical Repair And Modification

A–6
Ohmmeter
Diode
A
Ohmmeter
Diode
Digital Type
Ohmmeter
Bulb
10
INTRODUCTION–HOW TO PERFORM FOR SYSTEM INSPECTION
Analog Type
Wire Harness Repair Manual (RM1022E)
If the circuit has diodes, reverse the two leads and check
again.
When touching the negative (–) lead to the diode positive
(+) side and the positive (+) lead to the negative (–) side,
there should be continuity. When touching the two leads in
reverse, there should be no continuity.
HINT: Specifications may vary depending on the type of
tester, so refer to the tester's instruction manual before
performing the inspection.
Check LED (Light Emitting Diode) in the same manner as
that for diodes.
HINT:
D Use a tester with a power source of 3V or greater to
overcome the circuit resistance.
D If a suitable tester is not available, apply battery
voltage and check that the LED lights up.
(c) Use a volt/ohmmeter with high impedance (10kΩ/V
minimum) for troubleshooting of the electrical circuit.
3.

Bulb Check

(a) Remove the bulb.
(b) There should be continuity between the respective
terminals of the bulb together with a certain amount
of resistance.
(c) Apply the two leads of the ohmmeter to each of the
terminals.
(d) Apply battery voltage and check that the bulb light up.