Toyota Venza manuals

Toyota Venza: IG2 Signal Malfunction (B2788)

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 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 1 second.

  • IG2 relay
  • Wire harness
  • Power management control ECU
  • Steering lock ECU (Steering lock actuator assembly)

WIRING DIAGRAM


CAUTION / NOTICE / HINT

HINT:

After replacing the steering lock ECU (steering lock actuator assembly), confirm the Initialization of the steering lock (See page ).


PROCEDURE

1.

INSPECT NO. 2 IGNITION RELAY

(a) Remove the IG2 relay from the engine room junction block and relay block.


(b) 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 between terminals 1 and 2)

Text in Illustration

*1

IG2 Relay


NG

REPLACE NO. 2 IGNITION RELAY


OK

2.

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

(a) Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly).


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D17-1 (GND) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to Steering Lock ECU (Steering Lock Actuator Assembly))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D17-6 (IG2) - D17-1 (GND)

Engine switch on (IG)

10 to 14 V


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

*D17-6 (IG2) - D17-7 (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.

Text in Illustration

*1

Front view of wire harness connector

(to Steering Lock ECU (Steering Lock Actuator Assembly))


OK

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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