B2788

STEERING COLUMN: STEERING LOCK SYSTEM: B2788: IG2 Signal Malfunction

DTC B2788 - IG2 Signal Malfunction

DESCRIPTION

The steering lock ECU (steering lock actuator assembly) receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU (smart key ECU assembly) equals to the voltage that is applied to the steering lock ECU (steering lock actuator assembly), the steering wheel will be unlocked. The steering lock ECU (steering lock actuator assembly) will not lock the steering wheel when power from the IG2 relay is present. This prevents the steering from being locked while the vehicle is moving.

WIRING DIAGRAM

INSPECTION PROCEDURE
HINT: After replacing the steering lock ECU (steering lock actuator assembly), confirm the Initialization of the steering lock Programming and Relearning.

PROCEDURE

1. INSPECT NO. 2 IGNITION RELAY

(a) Remove the IG2 relay from the engine room junction block and relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

Text in Illustration

NG -- REPLACE NO. 2 IGNITION RELAY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)

(a) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly).
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY)

(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:

(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

*: This measurement is performed with the engine switch off to check for a battery voltage short in the IG2 circuit.

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)