”Rear Antilock” Warning Light Does Not Come On For 2 Seconds - Toyota Hilux Surf 1993 Owner's Manual

BR–80
"REAR ANTILOCK" warning light does not come on for about 2 seconds after
ignition switch on.
Disconnect service connector and ground
the terminal W of the wire harness side
connector. (Ignition switch on)
Does warning light come on ?
Disconnect connector from ECU and sole–
noid relay, and ground terminal W of ECU
wire harness side connector.
(ignition switch on)
Does warning light come on ?
With ignition switch off, disconnect sole–
noid relay connector, and check continu–
ity between terminal W and BS on sole–
noid relay side.
Reverse tester leads and check again. Is
there one way continuity between termi–
nals ?
Faulty ECU.
BRAKE SYSTEM
YES
YES
YES
– Rear–Wheel Anti–Lock Brake System
Bulb burned out or open circuit in wire harness
between warning light and service connector ter–
minal W.
Open circuit in wire harness between ECU termi–
nal W and warning light.
Short circuit in solenoid relay inside diode.
HINT: If the diode is short–circuited, a malfunction
at ECU terminal W will occur.
When inspecting the terminal, connect the ECU con–
nector and disconnect solenoid relay connector. Then
turn the ignition switch on, and check that the warn–
ing light goes on. If it does, the ECU terminal is OK.