Power Tilt & Telescopic Steering Column (Diagnostic Codes & Circuit Tests): Overview Lexus RX III

DESCRIPTION

Different voltage values are input to the multiplex tilt and telescopic ECU by operating the tilt and telescopic 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.

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1. READ VALUE USING TECHSTREAM (TILT UP/DOWN SWITCH, TELESCOPIC SHORT/LONG SWITCH) Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Check the tilt and telescopic manual switch. Enter the following menus: Body Electrical / Tilt & Telescopic / Data List. TILT & TELESCOPIC Tester Display Measurement Item/Range Normal Condition Diagnostic Note Telesco Short Switch Input state of telescopic short by manual switch/ OFF or ON OFF: Telescopic short not activated by manual switch ON: Telescopic short activated by manual switch - Telesco Long Switch Input state of telescopic long by manual switch/ OFF or ON OFF: Telescopic long not activated by manual switch ON: Telescopic long activated by manual switch - Tilt Down Switch Input state of tilt down by manual switch/ OFF or ON OFF: Tilt down not activated by manual switch ON: Tilt down activated by manual switch - Tilt Up Switch Input state of tilt up by manual switch// OFF or ON OFF: Tilt up not activated by manual switch ON: Tilt up activated by manual switch - OK "ON" is displayed on the Techstream screen when each switch is turned on. "OFF" is displayed on the Techstream screen when each switch is turned off. NG --> See step 3 OK: Go to next step
2. CONFIRM DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-400871-S22393106902011051800000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-400871-S22393106902011051800000) . RESULT Result Proceed to DTC is output. A DTC is not output. B B --> See step 6 A --> See step 7
3. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - TILT AND TELESCOPIC SWITCH) Disconnect the F36 multiplex tilt and telescopic ECU connector. Disconnect the F39 headlight dimmer switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F36-4 (VC) - F39-8 (VC) Always Below 1 ohms F36-3 (MSW) - F39-10 (MSW) F39-8 (VC) - Body ground Always 10 kohms or higher F39-10 (MSW) - Body ground TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU) *2 Front view of wire harness connector (to Headlight Dimmer Switch Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK MULTIPLEX TILT AND TELESCOPIC ECU (VC TERMINAL VOLTAGE) Reconnect the F36 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 F36-4 (VC) - F36-3 (MSW) Engine switch on (IG) 4.9 to 5.1 V TEXT IN ILLUSTRATION *1 Component with harness connected (Multiplex Tilt and Telescopic ECU) NG --> See step 7 OK: Go to next step
5. CHECK TILT AND TELESCOPIC SWITCH Remove the tilt and telescopic switch. Refer to «REMOVAL»(ref-400650-S30748462262011051800000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - 3 Tilt up 342 to 378 ohms Tilt down 1890.5 to 2089.5 ohms Telescopic contract 750.5 to 829.5 ohms Telescopic extend 152 to 168 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Tilt and Telescopic Switch) NG --> See step 8 OK --> See step 9
6. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-400649-S11887826212011051800000)
7. REPLACE MULTIPLEX TILT AND TELESCOPIC ECU. Refer to «REMOVAL»(ref-400650-S06308496202011051800000)
8. REPLACE TILT AND TELESCOPIC SWITCH. Refer to «REMOVAL»(ref-400650-S30748462262011051800000)
9. REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-400664-S39858339642011051800000)

Different voltage values are input to the multiplex tilt and telescopic ECU by operating the tilt and telescopic 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.

The tilt motor is operated by the power source voltage supplied from the multiplex tilt and telescopic ECU and makes the steering column tilt up and down. The tilt position sensor (Hall IC) in the tilt motor detects the tilt angle of the steering column and outputs a signal to the multiplex tilt and telescopic ECU based on that angle.

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HINT

Limit positions can be confirmed on the Techstream.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (TILT OPERATION) Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Check that the steering wheel tilts up and down. Enter the following menus: Body Electrical / Tilt & Telescopic / Active Test. TILT & TELESCOPIC Tester Display Test Part Control Range Diagnostic Note Tilt Operation Tilt operation UP/DOWN - OK The steering wheel tilts up and down. NG --> See step 6 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BATTERY) Disconnect the F36 multiplex tilt and telescopic ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F36-2 (+B) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Multiplex Tilt and Telescopic ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F36-11 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Multiplex Tilt and Telescopic ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - TILT MOTOR) Disconnect the F36 multiplex tilt and telescopic ECU connector. Disconnect the F35 tilt motor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F36-10 (TIM+) - F35-2 (TIM+) Always Below 1 ohms F36-1 (TIM-) - F35-1 (TIM-) F36-10 (TIM+) - Body ground Always 10 kohms or higher F36-1 (TIM-) - Body ground TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Multiplex Tilt and Telescopic ECU) *2 Rear view of wire harness connector (to Tilt Motor) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK TILT MOTOR Apply 12 V battery voltage to the tilt motor connector. Then check the steering wheel tilt operation. OK Measurement Condition Specified Condition 12 V battery positive (+) lead --> Terminal 1 (TIM-) 12 V battery negative (-) lead --> Terminal 2 (TIM+) The steering wheel tilts down. 12 V battery positive (+) lead --> Terminal 2 (TIM+) 12 V battery negative (-) lead --> Terminal 1 (TIM-) The steering wheel tilts up. TEXT IN ILLUSTRATION *1 Component without harness connected (Tilt Motor) NG --> See step 10 OK --> See step 11
6. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - TILT POSITION SENSOR) Disconnect the F36 multiplex tilt and telescopic ECU connector. Disconnect the F35 tilt motor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F36-6 (VCI) - F35-4 (VCI) Always Below 1 ohms F36-7 (TIS) - F35-5 (TIS) F36-17 (E1) - F35-6 (E1) F36-6 (VCI) - Body ground Always 10 kohms or higher F36-7 (TIS) - Body ground F36-17 (E1) - Body ground TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Multiplex Tilt and Telescopic ECU) *2 Rear view of wire harness connector (to Tilt Motor) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F36-11 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Multiplex Tilt and Telescopic ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (VCI, TIS TERMINAL VOLTAGE) Reconnect the F36 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 F35-4 (VCI) - F35-6 (E1) Engine switch on (IG) 8 to 16 V F35-5 (TIS) - F35-6 (E1) TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Tilt Motor) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. CHECK TILT POSITION SENSOR Reconnect the F35 tilt motor connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F36-7 (TIS) - F36-17 (E1) The steering wheel tilting up or tilting down Pulse generation High: 8 to 16 V Low: Below 1 V TEXT IN ILLUSTRATION *1 Component with harness connected (Multiplex Tilt and Telescopic ECU) NG --> See step 10 OK --> See step 11
10. REPLACE STEERING COLUMN ASSEMBLY. Refer to «REMOVAL»(ref-400650-S27675387012011051800000)
11. REPLACE MULTIPLEX TILT AND TELESCOPIC ECU. Refer to «REMOVAL»(ref-400650-S06308496202011051800000)

The tilt motor is operated by the power source voltage supplied from the multiplex tilt and telescopic ECU and makes the steering column tilt up and down. The tilt position sensor (Hall IC) in the tilt motor detects the tilt angle of the steering column and outputs a signal to the multiplex tilt and telescopic ECU based on that angle.

HINT

Limit positions can be confirmed on the Techstream.

The telescopic motor is operated by the power source voltage supplied from the multiplex tilt and telescopic ECU and slides the steering column forward and backward. The telescopic position sensor (Hall IC) in the telescopic motor detects the sliding position in the forward and backward directions of the steering column and outputs a signal to the multiplex tilt and telescopic ECU based on that sliding amount.

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HINT

Limit positions can be confirmed on the Techstream.

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The telescopic motor is operated by the power source voltage supplied from the multiplex tilt and telescopic ECU and slides the steering column forward and backward. The telescopic position sensor (Hall IC) in the telescopic motor detects the sliding position in the forward and backward directions of the steering column and outputs a signal to the multiplex tilt and telescopic ECU based on that sliding amount.

HINT

Limit positions can be confirmed on the Techstream.

The ECU power source circuit supplies positive (+) voltage to the multiplex tilt and telescopic ECU.

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1. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BATTERY) Disconnect the F36 multiplex tilt and telescopic ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F36-9 (ECUB) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Multiplex Tilt and Telescopic ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F36-11 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to Multiplex Tilt and Telescopic ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
3. REPLACE MULTIPLEX TILT AND TELESCOPIC ECU. Refer to «REMOVAL»(ref-400650-S06308496202011051800000)

The ECU power source circuit supplies positive (+) voltage to the multiplex tilt and telescopic ECU.

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the CAN communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a specified signal (periodic signal) onto the CAN communication bus on a regular schedule. The multiplex tilt and telescopic ECU detects the connection of each ECU based on the signal.

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the CAN communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a specified signal (periodic signal) onto the CAN communication bus on a regular schedule. The multiplex tilt and telescopic ECU detects the connection of each ECU based on the signal.

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the CAN communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a specified signal (periodic signal) onto the communication bus on a regular basis. The multiplex tilt and telescopic ECU receives vehicle speed signals from the combination meter via the CAN communication bus to prevent improper operation of the auto away/return function during driving.

HINT

*: If the engine switch is turned off immediately after the vehicle comes to a sudden stop, the last vehicle speed signal may not be 0 km/h (0 mph).

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the CAN communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a specified signal (periodic signal) onto the communication bus on a regular basis. The multiplex tilt and telescopic ECU receives vehicle speed signals from the combination meter via the CAN communication bus to prevent improper operation of the auto away/return function during driving.

HINT

*: If the engine switch is turned off immediately after the vehicle comes to a sudden stop, the last vehicle speed signal may not be 0 km/h (0 mph).

This is the power source for the power tilt and power telescopic steering column system.

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This is the power source for the power tilt and power telescopic steering column system.

The signals generated by operating the manual switch are sent to the multiplex tilt and telescopic ECU through the communication bus.

The signals generated by operating the manual switch are sent to the multiplex tilt and telescopic ECU through the communication bus.

When the engine switch is turned on (IG), the IG power source circuit supplies positive (+) voltage to the multiplex tilt and telescopic ECU.

The multiplex tilt and telescopic ECU also receives engine switch signals via this circuit.

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When the engine switch is turned on (IG), the IG power source circuit supplies positive (+) voltage to the multiplex tilt and telescopic ECU.

The multiplex tilt and telescopic ECU also receives engine switch signals via this circuit.