B2788

STEERING COLUMN: STEERING LOCK SYSTEM: B2788: IG2 Signal Malfunction
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 wheel from being locked while the vehicle is moving.

The steering lock ECU (steering lock actuator assembly) determines the on/off status of the engine switch through the IG2 signal circuit.

The diagnosis information of the steering lock ECU (steering lock actuator assembly) is transmitted to the Techstream via the certification ECU (smart key ECU assembly) as the steering lock ECU (steering lock actuator assembly) is not connected to the CAN communication system.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* If the steering lock ECU (steering lock actuator assembly) is replaced, with the engine switch off and the shift lever to P, open and close the driver side door to record the current lock position into the steering lock ECU (steering lock actuator assembly). If this is not performed, the engine may not start.
* After replacing the steering lock ECU (steering lock actuator assembly), perform the key ID code registration Engine Immobilizer System.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT
When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:

With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.

PROCEDURE

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

(a) Disconnect the F37 connector from the steering lock ECU.

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

Standard Resistance:

Text in Illustration

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

NG -- CHECK FOR SHORT IN ALL HARNESSES OR CONNECTORS CONNECTED TO IG2 FUSE AND REPLACE IGN FUSE

OK -- REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Disassembly