DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (TILT AND TELESCOPIC MANUAL SWITCH)
CONFIRM DTC
CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER SWITCH)
CHECK MULTIPLEX TILT AND TELESCOPIC ECU (VC TERMINAL VOLTAGE)
INSPECT TILT AND TELESCOPIC MANUAL SWITCH
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 tilt and telescopic manual switch. The multiplex tilt and telescopic ECU then judges which motor and in which direction that motor should be moved based on the voltage value.
| DTC Code | Detection Condition | Trouble Area |
| B2603 | When operating the tilt and telescopic manual switch, an abnormal voltage value is input to the multiplex tilt and telescopic ECU. | Tilt and telescopic manual switch
Tilt and telescopic manual switch circuit
Multiplex tilt and telescopic ECU
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER (TILT AND TELESCOPIC MANUAL SWITCH) |
Use the Data List to check if the tilt and telescopic manual switch is functioning properly.
Tilt & Telescopic| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Tilt Up Switch | Input state of tilt up by manual switch/ON or OFF | ON: Tilt up activated by manual switch
OFF: Tilt up not activated by manual switch | - |
| Tilt Down Switch | Input state of tilt down by manual switch/ON or OFF | ON: Tilt down activated by manual switch
OFF: Tilt down not activated by manual switch | - |
| Telesco Short Switch | Input state of telescopic short by manual switch/ON or OFF | ON: Telescopic short activated by manual switch
OFF: Telescopic short not activated by manual switch | - |
| Telesco Long Switch | Input state of telescopic long by manual switch/ON or OFF | ON: Telescopic long activated by manual switch
OFF: Telescopic long not activated by manual switch | - |
- OK:
- "ON" is displayed on the intelligent tester screen when each switch is turned on.
- "OFF" is displayed on the intelligent tester screen when each switch is turned off.
Check for DTCs ().
Result| Result | Proceed to |
| DTC is output | A |
| DTC is not output | B |
| | USE SIMULATION METHOD TO CHECK ()
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| A | |
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| REPLACE MULTIPLEX TILT AND TELESCOPIC ECU ()
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| 3.CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - HEADLIGHT DIMMER SWITCH) |
Disconnect the E27 multiplex tilt and telescopic ECU connector.
Disconnect the E14 headlight dimmer switch or E15 windshield wiper switch connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for Headlight Dimmer Switch LH Side Type| Tester Connection | Condition | Specified Condition |
| E27-4 (VC) - E14-8 (VC) | Always | Below 1 Ω |
| E27-3 (MSW) - E14-10 (MSW) |
| E14-8 (VC) - Body ground | Always | 10 kΩ or higher |
| E14-10 (MSW) - Body ground |
for Headlight Dimmer Switch RH Side Type| Tester Connection | Condition | Specified Condition |
| E27-4 (VC) - E15-6 (VC) | Always | Below 1 Ω |
| E27-3 (MSW) - E15-7 (MSW) |
| E15-6 (VC) - Body ground | Always | 10 kΩ or higher |
| E15-7 (MSW) - Body ground |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 4.CHECK MULTIPLEX TILT AND TELESCOPIC ECU (VC TERMINAL VOLTAGE) |
Reconnect the E27 multiplex tilt and telescopic ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E27-4 (VC) - E27-3 (MSW) | Engine switch on (IG) | 4.9 to 5.1 V |
| | REPLACE MULTIPLEX TILT AND TELESCOPIC ECU ()
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| 5.INSPECT TILT AND TELESCOPIC MANUAL SWITCH |
Remove the tilt and telescopic manual switch ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| 1 (VC) - 3 (MSW) | Tilt up | 342 to 378 Ω |
| Tilt down | 1890.5 to 2089.5 Ω |
| Telescopic contract | 750.5 to 829.5 Ω |
| Telescopic extend | 152 to 168 Ω |
Result| Result | Proceed to |
| OK (for headlight dimmer switch LH side) | A |
| OK (for headlight dimmer switch RH side) | B |
| NG | C |
| | REPLACE WINDSHIELD WIPER SWITCH ()
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| | REPLACE TILT AND TELESCOPIC MANUAL SWITCH ()
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| A | |
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| REPLACE HEADLIGHT DIMMER SWITCH ()
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