Toyota LAND CRUISER Service Manual Supplement page 252

BR-30
BRAKE SYSTEM (STATION WAGON) - ANTI-LOCK BRAKE SYSTEM (ABS)
"ABS" warning light does not come on for 3 seconds after ignition switch on.
2
Pull out the short pin and ground the terminal W of the
female side connector. (Ignition switch on)
Does warning light come on?
YES
Disconnect connectors from ECU and control relay
and ground terminal W or ECU wire harness side con-
enctor. (Ignition switch on)
Does warning light come on?
YES
With ignition switch off, disconnect control relay con-
nectors, and check continuity between terminal W
and BS on actuator side.
Reverse tester leads and check again.
Is there one way continuity between terminals?
YES
Faulty ECU.
Bulb burned out or open circuit in wire
NO
harness between warning light and control
relay terminal W.
NO
Open circuit in wire harness between ECU
terminal W and warning light.
NO
Short circuit in control 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 connector, and disconnect actuator con-
nectors and check connector. Then turn the
ignition switch on, and check that the warn-
ing light goes on. If it does, the ECU terminal
is OK.