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Steering System - Electronic Steering: Other Infiniti M45 II

Electronic Steering 20 illustrations ~1407 words

Vehicle Stopped

  1. Power steering components (gears, oil pump, pipes, etc.) are free from leakage, and that oil level is correct.
  2. Tires are inflated to specified pressure and are of specified size, and that steering wheel is a genuine Nissan part.
  3. Suspension utilizes the original design, and is free of modifications which increase vehicle weight.
  4. Wheel alignment is adjusted properly.

FAIL-SAFE FUNCTION

The fail-safe function operates to regulate solenoid valve operation in response to engine speed, thereby maintaining the required steering force.

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Scheme 14: FAIL-SAFE FUNCTION
Scheme 14: FAIL-SAFE FUNCTION

Fail-Safe Input Conditions

Fail-safe input conditionsRelease conditions
No vehicle speed signal entered for at least 10 seconds while driving at an engine speed of greater than 1,500 rpm.A vehicle speed signal of greater than 1.4 km/h (0.9 MPH) is entered Ignition switch is turned from "OFF" to "ON".
A vehicle speed signal of greater than 30 km/h (19 MPH) or abruptly drops below 2 km/h (1 MPH).

FAIL-SAFE INPUT CONDITIONS

Note. When the engine is revved up to 1,500 RPM or more for at least 10 seconds with vehicle at standstill, the failsafe function operates; however, this is not a matter of concern. The fail-safe function can be released by driving vehicle of a speed of greater than 1.4 km/h (0.9 MPH) or by turning ignition switch from "OFF" to "ON".

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Scheme 15: HYDRAULIC CIRCUIT
Scheme 15: HYDRAULIC CIRCUIT

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Scheme 16: Component Parts Location
Scheme 16: Component Parts Location

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Scheme 17: Wiring Diagram
Scheme 17: Wiring Diagram

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Control Unit Input/Output Signal Standard

The standard values (voltage), measured with an analog tester in contact with control unit terminal, are shown in illustration

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Scheme 19: Control Unit Input/Output Signal Standard
Scheme 19: Control Unit Input/Output Signal Standard

BCM Input/Output Signal Standard

TerminalWire colorMeasuring pointStandard value
17BR/YData link (RX line)
18PData link (TX line)
22R/BTelescopic switch FR signalTelescopic switchForward operation (Motor operated)Approx. 0V
OFFApprox. 5V
23PU/RTilt switch DOWN signalTilt switchDOWN operation (Motor operated)Approx. 0V
OFFApprox. 5V
26G/BTelescopic switch RR signalTelescopic switchBackward operation (Motor operated)Approx.0V
OFFApprox. 5V
36P/LTilt switch UP signalTilt switchUP operation (Motor operated)Approx. 0V
OFFApprox. 5V
56BGroundIgnition switch ONApprox. 0V
101P/LTelescopic motor FR signalTelescopic switch forward operation.Battery voltage (Approx. 12V)
102PTilt motor DOWN signalTilt switch DOWN operationBattery voltage (Approx. 12V)
103R/BTilt motor UP signalTilt switch UP operationBattery voltage (Approx. 12V)
104Y/BPower supply for tilt and telescopic deviceIgnition switch OFFBattery voltage (Approx. 12V)
105Y/LBAT power supplyIgnition switch OFFBattery voltage (Approx. 12V)
107P/BTelescopic motor RR signalTelescopic switch backward operationBattery voltage (Approx. 12V)
113BGroundIgnition switch ONApprox. 0V
114BGround for tilt and telescopic deviceIgnition switch ONApprox. 0V

BCM INPUT/OUTPUT SIGNAL STANDARD DATA

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Scheme 20: POWER SUPPLY AND GROUND CIRCUIT INSPECTION
Scheme 20: POWER SUPPLY AND GROUND CIRCUIT INSPECTION

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Scheme 21
  1. CHECK FUSE Check if any of the following fuses in the BCM are blown. FUSE CHECKING Unit Terminal No. Power source Fuse No. BCM 105 Power source #3 OK or NG? OK: GO TO 2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to «POWER DISTRIBUTION»(ref-158468-S20318886572003092900000) in SYSTEM WIRING DIAGRAMS article.
  2. CHECK POWER SUPPLY CIRCUIT (BCM) Disconnect BCM connector. Turn ignition switch ON. Check voltage between BCM harness connector M4 terminal 104 (Y/B), 105 (Y/L) and ground. BCM HARNESS CONNECTOR TERMINALS VOLTAGE Termimals Power Source Condition Voltage (V) (+) (-) Connector Terminal M4 104 (Y/B) 105 (Y/L) Ground BAT power supply Ignition switch OFF Battery voltage OK or NG? OK: GO TO 3. NG: Repair or replace harness. Check harness for open or short between BCM and fuse.
  3. CHECK GROUND CIRCUIT (BCM) Turn ignition switch OFF. Check continuity between BCM harness connector M4 terminal 56 (B), 113 (B), 114 (B) and ground. BCM HARNESS CONNECTOR TERMINAL CONTINUITY Terminals Condition Continuity (+) (-) Connector Terminal M4 56 (B) Ground Ignition switch OFF Yes 113 (B) Ground Ignition switch OFF Yes 114 (B) Ground Ignition switch OFF Yes OK or NG? OK: Preliminary check is OK. NG: Repair or replace BCM ground harness.

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Scheme 22: Symptom 1: Telescopic System Does Not Operate
Scheme 22: Symptom 1: Telescopic System Does Not Operate

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Scheme 27
  1. CHECK STEERING WHEEL TELESCOPIC MECHANISM Check the following. Operation malfunction caused by steering wheel telescopic mechanism deformation or pinched harness or other foreign materials. Operation malfunction and interference with other parts by poor installation. OK or NG OK: GO TO 2. NG: Repair the malfunctioning part and check again.
  2. CHECK TELESCOPIC SWITCH INPUT/OUTPUT Disconnect steering position switch connector. Check voltage between steering position switch harness connector M51 terminals 4 (G/B), 5 (R/B) and ground. STEERING POSITION SWITCH HARNESS CONNECTOR TERMINALS VOLTAGE Terminals Voltage (V) (+) (-) Connector Terminal M51 4 (G/B) Ground Approx. 5V 5 (R/B) Ground Approx. 5V OK or NG OK: GO TO 3. NG: GO TO 5 .
  3. CHECK STEERING POSITION SWITCH GROUND CIRCUIT Check continuity between steering position switch harness connector M51 terminal 1 (B) and ground. 1 (B) - Ground: Continuity should exist. OK or NG OK: GO TO 4. NG: Replace or replace harness.
  4. CHECK TELESCOPIC SWITCH Check continuity between steering position switch connector terminals 4, 5 and 1. STEERING POSITION SWITCH CONNECTOR TERMINALS CONTINUITY Terminals Steering position switch operation Continuity 4 - 1 Backward position Yes Neutral or forward position No 5 - 1 Forward position Yes Neutral or backward position No OK or NG OK: GO TO step 6 . NG: Replace steering position switch.
  5. CHECK HARNESS CONTINUITY Disconnect BCM connector. Check continuity between BCM harness connector M4 terminals 22 (R/B), 26 (G/B) and steering position switch harness connector M51 terminals 4 (G/B), 5 (R/B). Check continuity between BCM harness connector M4 terminals 22 (R/B), 26 (G/B) and ground. BCM CONNECTORS AND STEERING POSITION SWITCH CONNECTOR TERMINAL CONTINUITY Terminals Continuity (+) (-) Connector Terminal Connector Terminal M4 22 (R/B) M51 5 (R/B) Yes 26 (G/B) 4 (G/B) Yes 22 (R/B) Ground No 26 (G/B) Ground No OK or NG? OK: Replace BCM. NG: Repair or replace harness.
  6. CHECK BCM OUTPUT SIGNAL Disconnect telescopic motor connector. Check voltage between telescopic motor harness connector M60 terminals 1 (P/L), 2 (P/B) and ground. TELESCOPIC MOTOR HARNESS CONNECTOR TERMINALS VOLTAGE Terminals Condition Voltage (+) (-) Connector Terminal M60 1 (P/L) Ground Telescopic switch (FR operation) Battery voltage 2 (P/B) Ground Telescopic switch (RR operation) Battery voltage 1 (P/L), 2 (P/B) Ground Telescopic switch OFF 0V OK or NG OK: Replace telescopic motor. NG: GO TO 7.
  7. CHECK TELESCOPIC MOTOR CIRCUIT Disconnect BCM and telescopic motor connectors. Check continuity between BCM harness connector M4 terminals 101 (P/L), 107 (P/B) and telescopic motor harness connector M60 terminals 1 (P/L), 2 (P/B). Check continuity between BCM harness connector M4 terminals 101 (P/L), 107 (P/B) and ground. BCM HARNESS CONNECTOR AND TELESCOPIC MOTOR HARNESS CONNECTOR TERMINALS CONTINUITY Terminals Continuity BCM (+) Telescopic motor (-) Connector Terminal Connector Terminal M4 101 (P/L) M60 1 (P/L) Yes 107 (P/B) 2(P/B) Yes 101 (P/L) Ground No 107 (P/B) Ground No OK or NG OK: Replace BCM. NG: Repair or replace harness.

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Scheme 28: Symptom 2: Tilt System Does Not Operate
Scheme 28: Symptom 2: Tilt System Does Not Operate

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Scheme 33
  1. CHECK STEERING WHEEL TILT MECHANISM Check the following. Operation malfunction caused by steering wheel tilt mechanism deformation or pinched harness or other foreign materials. Operation malfunction and interference with other parts by poor installation. OK or NG OK: GO TO 2. NG: Repair the malfunctioning part and check again.
  2. CHECK TILT SWITCH INPUT/OUTPUT Disconnect steering position switch connector. Turn ignition switch ON. Check voltage between steering position switch harness connector M51 terminals 2 (P/L), 3 (PU/R) and body ground. STEERING POSITION SWITCH HARNESS CONNECTOR TERMINAL VOLTAGE Terminals Voltage (V) (+) (-) Connector Terminal M4 2 (P/L) Ground 5V 3 (PU/R) Ground 5V OK or NG OK: GO TO 3. NG: GO TO 5 .
  3. CHECK STEERING POSITION SWITCH GROUND CIRCUIT Turn ignition switch OFF. Check continuity between steering position switch harness connector M51 terminal 1 (B) and body ground. 1 (B) - Ground: Continuity should exist. OK or NG OK: GO TO 4. NG: Repair or replace harness.
  4. CHECK TILT SWITCH Check continuity between steering position switch connector terminals 2, 3 and 1. STEERING POSITION SWITCH CONNECTOR TERMINALS CONTINUITY Terminals Steering position switch operation Continuity 2 - 1 Tilt up position Yes Neutral or tilt down position No 3 - 1 Tilt down position Yes Neutral or tilt up position No OK or NG OK: GO TO 6 . NG: Replace steering position switch.
  5. CHECK HARNESS CONTINUITY Disconnect BCM connector. Check continuity between BCM harness connector M4 terminals 23 (PU/R), 36 (P/L) and steering position switch harness connector M51 terminals 2 (P/L), 3 (PU/R). Check continuity between BCM harness connector M4 terminals 23 (PU/R), 36 (P/L) and ground. HH BCM HARNESS CONNECTOR AND STEERING POSITION SWITCH HARNESS CONNECTOR TERMINAL CONTINUITY Terminals Continuity (+) (-) BCM SPSConnector Terminal SPS Connector Terminal M4 23 (PU/R) M51 3 (PU/R) Yes 36 (P/L) 2(P/L) Yes 23 (PU/R) Ground No 36 (P/L) Ground No OK or NG OK: Replace BCM. NG: Repair or replace harness.
  6. CHECK BCM OUTPUT SIGNAL Disconnect tilt motor connector. Check voltage between tilt motor harness connector M58 terminals 1 (R/B), 2 (P) and ground. TILT MOTOR HARNESS CONNECTOR TERMINALS VOLTAGE Terminals Condition Voltage (+) (-) Connector Terminal M58 1 (R/B) Ground Tilt switch (UP operation) Battery voltage 2 (P) Ground Tilt switch (DOWN operation) Battery voltage 1 (R/B), 2 (P) Ground Tilt switch OFF 0V OK or NG OK: Replace tilt motor. NG: GO TO 7.
  7. CHECK TILT MOTOR CIRCUIT Disconnect BCM and telescopic motor connectors. Check continuity between BCM harness connector M4 terminals 102 (P), 103 (R/B) and tilt motor harness connector M58 terminals 1 (R/B), 2 (P). Check continuity between BCM harness connector M4 terminals 102 (P), 103 (R/B) and body ground. BCM HARNESS CONNECTOR AND TILT MOTOR HARNESS CONNECTOR TERMINALS CONTINUITY Terminals Continuity BCM (+) Tilt motor (-) Connector Terminal Connector Terminal M4 102(P) M58 2(P) Yes 103 (R/B) 1 (R/B) Yes 102(P) Ground No 103 (R/B) Ground No OK or NG OK: Replace BCM. NG: Repair or replace harness.

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