B2788

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

DTC 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 tester 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

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:
Before starting the inspection, with the engine switch off, open the driver's door. Then (with the engine switch still off) open and close any door several times in 1.5-second intervals.
NOTE: If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in the N position, open and close the driver's door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.

PROCEDURE

1. INSPECT IGNITION RELAY NO. 2 (IG2)




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






NG -- REPLACE IGNITION RELAY NO. 2 (IG2)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND)




(a) Disconnect the D11 connector from the steering lock actuator assembly.
(b) 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.
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - 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 short between IG2 and battery voltage.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)
OK -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)