4E-12 ABS:
Circuit Description
Operation (ON/OFF) of ABS warning lamp is controlled by ABS control module through lamp driver module in
combination meter.
If the antilock brake system is in good condition, ABS control module turns ABS warning lamp ON at the ignition switch
ON, keeps it ON for 2 seconds and then turns it OFF. If an abnormality in the system is detected, ABS warning lamp is
turned ON continuously by ABS control module. Also, it is turned ON continuously by lamp driver module when the
connector of ABS control module is disconnected.
Troubleshooting
Step Action Yes No
1 1) Turn ignition switch to ON position.
Do other warning lamps come ON?
Go to Step 2. Go to Step 3.
2 1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch to OFF position and check DTC.
Is there DTC U1073?
Go to “DTC U1073:
Control Module
Communication Bus
Off: ”.
Substitute a known-
good combination meter
and recheck. If ABS
warning lamp remains
OFF, substitute a
known-good ABS
hydraulic unit / control
module assembly and
recheck.
3 Is Circuit fuse for combination meter in good condition? Go to Step 4. Replace fuse and check
for short circuit to
ground.
4 Check CAN communication circuit between combination
meter and ABS hydraulic unit / control module referring to
“DTC U1073: Control Module Communication Bus Off: ”.
Is CAN communication circuit in good condition?
Go to Step 5. Repair or replace.
5 1) Remove combination meter with ignition switch turned
OFF.
2) Check for proper connection to “PPL/RED” and “BLK”
wire of combination meter connector.
3) If OK, turn ON ignition switch and measure voltage at
“PPL/RED” wire of combination meter connector and
vehicle body ground.
Is it 10 – 14 V?
Go to Step 6. Repair power supply
circuit for combination
meter.
6 1) Measure resistance between “BLK” wire of combination
meter connector and vehicle body ground.
Is resistance less than 2
Ω
?
Replace combination
meter.
“BLK” circuit open or
high resistance.
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