DTC B22A0: IG2 Terminal Circuit Low: Procedure

WARNING: This page is about a different car, the 2012 Lexus LS 460. However, it is still accessible from the selected car via links, so may be relevant.

CHECK PASSENGER SIDE JUNCTION BLOCK (IG INPUT VOLTAGE)

Fig 1: Identifying PK Junction Block Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the PK junction block connector.

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

Standard voltage

Tester Connection	Switch Condition	Specified Condition
PK-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

NG → See step 3

OK: Go to next step

INSPECT FUSE (P IG2)

Remove the P IG2 fuse from the passenger side junction block.

Measure the resistance of the fuse.

Standard resistance

Tester Connection	Condition	Specified Condition
P IG2 fuse	Always	Below 1 Ω

NG → REPLACE FUSE

OK → REPLACE PASSENGER SIDE JUNCTION BLOCK (ELECTRIC POWER CONTROL ECU)

CHECK HARNESS AND CONNECTOR (PASSENGER SIDE J/B - ENGINE ROOM NO. 2 J/B)

Fig 2: Identifying PK And 2C Junction Block Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the PK and 2C junction block connectors.

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

Standard resistance

Tester Connection	Condition	Specified Condition
PK-1 (IG) - 2C-25	Always	Below 1 Ω
PK-1 (IG) or 2C-25 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 JUNCTION BLOCK - BATTERY)

Fig 3: Identifying 2E Junction Block Connector

Disconnect the 2E junction block connector.

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

Standard voltage

Tester Connection	Condition	Specified Condition
2E-1 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT FUSE (ECU-IG)

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

Measure the resistance of the fuse.

Standard resistance

Tester Connection	Condition	Specified Condition
ECU-IG fuse	Always	Below 1 Ω

NG → REPLACE FUSE

OK: Go to next step

CHECK FOR DTC (B2273)
1. Check for DTC B2273. Refer to DTC CHECK/CLEAR .
  OK
  
  DTC B2273 is not output.
NG → See step 7

OK → REPLACE ENGINE ROOM NO. 2 JUNCTION BLOCK
GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Starting). Refer to DIAGNOSTIC TROUBLE CODE TABLE