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 integration relay (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 integration relay (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 (smart key ECU assembly) 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 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. INSPECT STEERING LOCK ECU





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

Standard Voltage:





NG -- INSPECT FUSE (IGN, IG2 MAIN)

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

2. INSPECT FUSE (IGN, IG2 MAIN)

(a) Remove the IGN and IG2 MAIN fuses from the engine room relay block.

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

Standard Resistance:





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

3. INSPECT INTEGRATION RELAY (IG2 RELAY)





(a) Remove the integration relay from the engine room relay block.

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

Standard Resistance:





NG -- REPLACE INTEGRATION NO.1 RELAY (IG2 RELAY)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - INTEGRATION RELAY (IG2 RELAY) AND BODY GROUND)





(a) Disconnect the E26 steering lock ECU connector.

(b) Disconnect the 1B and 1C integration relay connectors.

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

Standard Voltage:





Standard Resistance:





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

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





(a) Disconnect the E2 main body ECU connector.

(b) Disconnect the 1B integration relay connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU