Lexus IS250 · Service Manual STEERING

B2620

Diagnostic trouble codes

DESCRIPTION

The ECU power source circuit supplies positive voltage to the multiplex tilt & telescopic ECU.
DTC No.
 Detection Item
 Trouble Area
B2620
 The voltage of the ECU power source drops to 8 V or less and this condition continues for 10 sec. or more.
  1. Battery
  2. Wire harness or connector
  3. Multiplex tilt & telescopic ECU

WIRING DIAGRAM

C113488E01

INSPECTION PROCEDURE


1. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - BATTERY)

  1. C106463E36
    Disconnect the J28 connector from the multiplex tilt & telescopic ECU.

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

    Standard voltage:
    Tester connection
    (Terminal No.)
    		 Condition
    		 Specified value
    ECUB (J28-9) - Body ground
    		 Always
    		 10 to 14 V



NG
Go to step 3
OK


2. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - BODY GROUND)

  1. C106463E35
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester connection
    (Terminal No.)
    		 Condition
    		 Specified value
    GND (J28-11) - Body ground
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MULTIPLEX TILT & TELESCOPIC ECU

3. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - COWL SIDE J/B RH)

  1. C106480E05
    Disconnect the RA connector from the main body ECU RH (cowl side J/B RH).

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

    Standard resistance:
    Tester condition
    (Terminals No.)
    		 Condition
    		 Specified value
    ECUB (J28-9) - RA-18
    		 Always
    		 Below 1 Ω
    ECUB (J28-9) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - COWL SIDE J/B RH)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - COWL SIDE J/B RH)


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