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. Then the multiplex tilt and telescopic ECU judges which motor and which direction tilt motor or telescopic motor should be moved based on the voltage value.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM




(a) Connect Techstream to DLC3.
(b) Turn the ignition switch to ON and push Techstream main switch ON.
(c) Select the item "T&T Manual SW Data" in the Data List.
(d) Read voltages on the tester screen when operating the manual switch.
Standard voltage:






Result:






B -- REPLACE TILT AND TELESCOPIC SWITCH
A -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
C -- Continue to next step.
2. INSPECT MULTIPLEX TILT AND TELESCOPIC ECU




(a) Remove multiplex tilt and telescopic ECU with the connector being connected.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between terminal VC and GND of ECU connector.
Standard voltage:
4.9 to 5.1 V
NG -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
OK -- Continue to next step.
3. INSPECT TILT AND TELESCOPIC MANUAL SWITCH




(a) Disconnect the steering sensor connector.
(b) Measure the resistance between terminal VC and MSW of steering sensor connector when operating the manual switch.
Standard resistance:






NG -- REPLACE TILT AND TELESCOPIC SWITCH
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (TILT AND TELESCOPIC ECU - TILT AND TELESCOPIC SWITCH)
(a) Check for open and short circuit in the harness and the connector between the multiplex tilt and telescopic ECU and the tilt and telescopic manual switch Electronic Circuit Inspection Procedure.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU