B2788

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

DESCRIPTION

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

After receiving an IG2 relay ON signal, the steering lock ECU determines that the vehicle is moving.

The steering lock ECU does not lock the steering when it receives the IG2 relay ON signal. This prevents the steering from being locked while the vehicle is moving.

The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to the CAN communication system.





WIRING DIAGRAM





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 step 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 STEERING LOCK ACTUATOR (IG2 VOLTAGE)





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

Standard voltage:





OK -- REPLACE STEERING LOCK ACTUATOR
NG -- Continue to next step.

2. INSPECT FUSE (ECU-IG, P IG2)

(a) Remove the ECU-IG fuse from the engine room No. 2 junction block.

(b) Remove the P IG2 fuse from the passenger side junction block.

(c) Measure the resistance of the fuses.

Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

3. INSPECT IGNITION RELAY NO.2 (IG2)

(a) Remove the ignition relay No. 2 from the engine room No. 2 junction block.





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

Standard resistance:





NG -- REPLACE IG2 RELAY
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (IG2 RELAY - MAIN BODY ECU AND BODY GROUND)





(a) Disconnect the L12 main body ECU connector.

(b) Remove the ignition relay No. 2 from the engine room No. 2 junction block.

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

Standard resistance:





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

5. CHECK MAIN BODY ECU (IG2D OPERATION)

(a) Connect the L12 main body ECU connector.

(b) Remove the ignition relay No. 2 from the engine room No. 2 junction block.





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

Standard voltage:





NG -- REPLACE MAIN BODY ECU
OK -- Continue to next step.

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

(a) Disconnect the L33 steering lock ECU connector.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE STEERING LOCK ACTUATOR