B2603

STEERING COLUMN: POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM: B2603: Tilt and Telescopic Manual Switch Circuit Malfunction

DTC B2603 - Tilt and Telescopic Manual Switch Circuit Malfunction

DESCRIPTION

Different voltage values are input to the multiplex tilt and telescopic ECU by operating the manual switch. The multiplex tilt and telescopic ECU then judges which motor and in which direction that the motor should rotate based on the voltage value.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (TILT AND TELESCOPIC MANUAL SWITCH)





(a) Use the Data List to check if the tilt and telescopic manual switch is functioning properly.
(1) Intelligent tester

TILT & TELESCO:





(2) Techstream

Tilt & Telescopic:





Result





B -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - WINDSHIELD WIPER SWITCH)





(a) Disconnect the L34 multiplex tilt and telescopic ECU connector.
(b) Disconnect the L25 windshield wiper switch connector.
(c) 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. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (TILT AND TELESCOPIC MANUAL SWITCH)
(a) Use the Data List to check if the tilt and telescopic manual switch is functioning properly.
(1) Intelligent tester

COMBI SW:





(2) Techstream

Combination Switch:





Result





B -- REPLACE WINDSHIELD WIPER SWITCH (COMBINATION SWITCH ECU)
A -- Continue to next step.
4. INSPECT TILT AND TELESCOPIC MANUAL SWITCH





(a) Remove the headlight dimmer switch Removal.
(b) Disconnect the tilt and telescopic manual switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE TILT AND TELESCOPIC MANUAL SWITCH
OK -- REPLACE HEADLIGHT DIMMER SWITCH