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Steering Lock Unit Diagnosis Guide

The diagnostic procedure involves 5 steps to diagnose a B27DC DTC for the steering lock power supply: 1) Check the voltage supply to the steering lock unit, 2) Check the steering lock power supply circuit, 3) Replace the BCM if the circuit is good, 4) Replace the steering lock unit if the problem persists, 5) Check for intermittent issues if replacing did not fix it.

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Marc Amores
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264 views2 pages

Steering Lock Unit Diagnosis Guide

The diagnostic procedure involves 5 steps to diagnose a B27DC DTC for the steering lock power supply: 1) Check the voltage supply to the steering lock unit, 2) Check the steering lock power supply circuit, 3) Replace the BCM if the circuit is good, 4) Replace the steering lock unit if the problem persists, 5) Check for intermittent issues if replacing did not fix it.

Uploaded by

Marc Amores
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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B27DC S/L POWER SUPPLY

< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]


B27DC S/L POWER SUPPLY
DTC Logic INFOID:0000000010438877

DTC DETECTION LOGIC

DTC No. CONSULT screen items DTC detecting condition


When power is supplied to the steering lock unit even though BCM is not supplying
B27DC–00 S/L POWER SUPPLY
power to the steering lock unit.

POSSIBLE CAUSE
• Harness or connectors
(Steering lock unit power supply circuit is open or shorted)
• BCM
• Steering lock unit
FAIL-SAFE
Inhibit steering lock
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check DTC in “Self Diagnosis Result” mode of “BCM” using CONSULT.
Is DTC detected?
YES >> Refer to SEC-144, "Diagnosis Procedure".
NO-1 >> To check malfunction symptom before repair: Refer to GI-44, "Intermittent Incident".
NO-2 >> Confirmation after repair: INSPECTION END
Diagnosis Procedure INFOID:0000000010438878

1.CHECK STEERING LOCK UNIT POWER SUPPLY


Check voltage between steering lock unit harness connector and ground.

(+)
Steering lock unit (-) Condition Voltage
Connector Terminal
Active 9 - 16 V
M46 2 Ground Steering lock unit
Not active 0 - 0.5 V
Is the inspection result normal?
YES >> GO TO 5
NO >> GO TO 2
2.CHECK STEERING LOCK UNIT POWER SUPPLY CIRCUIT
1. Disconnect BCM connector and steering lock unit connector.
2. Check continuity between steering lock unit harness connector and BCM harness connector.

Steering lock unit BCM


Continuity
Connector Terminal Connector Terminal
M46 2 M87 41 Existed
3. Check voltage between BCM harness connector and ground.

BCM
Continuity
Connector Terminal Ground
M87 41 Not existed

SEC-144
B27DC S/L POWER SUPPLY
< DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
Is the inspection result normal?
YES >> GO TO 3 A
NO >> Repair or replace harness.
3.REPLACE BCM
B
Replace BCM. Refer to BCS-135, "Removal and Installation".
Is the inspection result normal?
YES >> INSPECTION END C
NO >> GO TO 4
4.REPLACE STEERING LOCK UNIT
Replace steering lock unit. Refer to SEC-81, "STEERING LOCK UNIT : Work Procedure". D
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5 E

5.CHECK INTERMITTENT INCIDENT


Refer to GI-44, "Intermittent Incident". F

>> INSPECTION END


G

SEC

SEC-145

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