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 & telescopic ECU by operating the manual switch. The multiplex tilt & telescopic ECU then judges which motor and in which direction that motor should be moved based on the voltage value.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM





(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch on.
(c) Turn the Techstream on.
(d) Read voltages on the Techstream screen when operating the manual switch. Enter the following menus: Chassis / Tilt&Telescopic / Data List.

Tilt&Telescopic





Result:






B -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
A -- REPLACE MULTIPLEX TILT & TELESCOPIC ECU
C -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (BETWEEN TILT & TELESCOPIC ECU AND TILT & TELESCOPIC SWITCH)





(a) Disconnect the T4 connector from the multiplex tilt & telescopic ECU.
(b) Disconnect the C10 connector from the headlight dimmer switch assembly.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT MULTIPLEX TILT & TELESCOPIC ECU (VC TERMINAL VOLTAGE)





(a) Reconnect the T4 connector to the multiplex tilt & telescopic ECU.
(b) Measure the voltage according to the value(s) in the table below.
Voltage:






NG -- REPLACE MULTIPLEX TILT & TELESCOPIC ECU
OK -- Continue to next step.
4. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY (TILT & TELESCOPIC MANUAL SWITCH)





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






NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- REPLACE MULTIPLEX TILT & TELESCOPIC ECU