B2788

DESCRIPTION

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

DTC No.	DTC Detecting Condition	Trouble Area
B2788	Different information is obtained from IG2 signals received directly from the IG2 circuit, and from IG2 signals sent via LIN communication for a period of 1 second.	IG2 relay Wire harness Power source control ECU Steering lock actuator assembly (Steering lock ECU)

WIRING DIAGRAM

INSPECTION PROCEDURE

1. INSPECT IG2 RELAY

1. Remove the IG2 relay from the engine room R/B No.2.

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

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG	REPLACE IG2 RELAY

OK

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

1. Disconnect the J29 connector from the steering lock actuator assembly.

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

   Standard resistance:

   Tester connection (Symbols)	Condition	Specified condition
   J29-1 (GND) - Body ground	Always	Below 1 Ω
   J29-2 (SGND) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

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

   Standard voltage:

   Tester connection (Symbols)	Condition	Specified condition
   J29-6 (IG2) - J29-1 (GND)	Engine switch on (IG)	10 to 14 V
   J29-6 (IG2) - J29-2 (SGND)	Engine switch on (IG)	10 to 14 V

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

   Standard resistance:

   Tester connection (Symbols)	Condition	Specified condition
   *J29-6 (IG2) - J29-7 (B)	Engine switch off	10 kΩ or higher

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

OK	REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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