Hyundai Tucson: When Ignition Key Is Turned ON (engine OFF), The ABS Warning Lamp Does Not Light Up.
Detecting condition
When current flows in the HECU the ABS warning lamp turns from ON to OFF as the initial check. Therefore if the lamp does not light up. the cause may be an open in the lamp power supply circuit, a blown bulb, an open in the both circuits between the ABS warning lamp and the HECU, and the faulty HECU.
- Faulty ABS warning lamp bulb
- Blown fuse is related to ABS in the engine compartment junction block
- Faulty ABS warning lamp damaged
- Faulty ABS warning lamp module
- Faulty HECU
Inspection procedures
Problem verification
- Disconnect the connector from the ESC control module and turn the ignition switch ON.
- Does the ABS warning lamp light up?
Inspectagain after replacing the
ESC HECU.
Check the power source for the ABS
warning lamp.
Check the power source for the ABS warning lamp
- Disconnect the instrument cluster connector (M08) and turn the ignition switch ON.
- Measure the voltage between terminal (M08) 39 of the cluster harness side connector and body ground.
Specification : approximately B+
- Is voltage within specification?
Check the CAN circuit resistance
for ABS warning lamp.
Check for blown fuse.
Check the CAN circuit resistance for ABS warning lamp
- Disconnect the instrument cluster connector (M08) and turn the ignition switch OFF.
- Measure the resistance between terminal (M08) 32 and 33 of the cluster harness side connector.
Specification : 60 
- Is resistance within specification?
Repair
ABS warning lamp bulb or instrument cluster assembly.
Check the CAN circuit wiring for
ABS warning lamp.
Check the CAN circuit wiring for ABS warning lamp
- Disconnect the instrument cluster connector (M08) and ESC HECU connector, and then turn the ignition switch OFF.
- Check for continuity between terminal (M08) 32 of the cluster harness side connector and terminal 26 of ESC HECU harness side.
Check for continuity between terminal (M08) 33 of the cluster harness side connector and terminal 14 of ESC HECU harness side.
Specification : Below 1
- Is resistance within specification?
Repair short of wiring between
terminal 26. 14 of ESC HECU harness connector
and ABS warning lamp module.
Repair
open of wiring between terminal 26. 14 of ESC HECU harness connector
and ABS warning lamp module.
READ NEXT:
Even After The Engine Is Started, The ABS Warning Lamp Remains ON
Detecting condition
If the HECU detects trouble, it lights the ABS warning lamp while at the
same time prohibiting ABS control. At this time, the HECU records a
DTC in memory. Even though the normal code is output, the ABS
warning lamp remains ON
ESC Control unit (HECU)
Components
Front - right (FR)
Rear - left (RL)
Rear - right (RR)
Front - left (FL)
MC2
MCI
ESC Control unit (HECU) connector
Bracket
ESC Control unit (HECU)- Removal
Removal
Disconnect the battery negative ( - ) terminal.
ESC Control unit (HECU) - Adjustment
Adjustment
Perform diagnostic procedure by using diagnostic device as shown below :
Connect self-diagnosis connector (16pins) located under the driver side
crash pad to self-diagnosis device, and then torn the
self-diagnosis device after ke
SEE MORE:
ICU (Integrated Central Control Unit)
Dscription and Operation
ICU (Integrated Central Control Unit) is an integrated model of smart
junction block and central gateway.
It performs the function of conventional "Smart junction block" and the function
of communication med
Fuel Filler Door
Component Location
Fuel filler door release actuator
Inspection
Disconnect the negative (-) battery terminal.
Remove the fuel filler housing after opening the fuel filler door.
(Refer to Body - "Fuel Filler Door")
Dis
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