LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 1992 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Steering Column Switches) >> Testing >> Shift Lock System >> Diagnostic Procedure 2
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure 2

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1990 Nissan Stanza, 1990 Nissan Sentra, 1990 Nissan Pulsar NX, 1990 Nissan Pickup, and 1990 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check power source: Locate shift lock control unit under left side of instrument panel. With ignition OFF, check for battery voltage between control unit connector terminal 2 (Red/Yellow wire) and ground, and between terminal 4 (Red/White wire) and ground. See WIRING DIAGRAMS  . If battery voltage is present in both cases, go to next step. If battery voltage is not present in both cases, check for continuity between battery and control unit connector terminals 2 and 4, and inspect fuses "X" and "M".
  2. Check ignition signal: With ignition OFF, check for battery voltage between control unit connector terminal 6 (Green/Yellow or Green/Blue wire) and ground. See WIRING DIAGRAMS  . Turn ignition ON and recheck. Voltage should be 0 Volts with ignition OFF and battery voltage should be present with ignition ON. If voltage is as specified, go to next step. If voltage is not as specified, inspect fuze "Z", ignition switch, and continuity of green/yellow (or green/blue wire) between battery and control unit.
  3. Check control unit ground circuit: Turn ignition OFF and disconnect control unit connector. Check for continuity between control unit connector terminal 9 (Black wire) and ground. See WIRING DIAGRAMS  . If continuity is not present, repair open in black wire or control unit connector. If continuity is present, go to next step.
  4. Check key input signal: Reconnect control unit connector and remove key from ignition. If key cannot be removed for test, use emergency switch. Measure voltage between control unit connector terminal 11 (Yellow/Red wire) and ground. See WIRING DIAGRAMS  . Insert key and measure again. Voltmeter should read 0 Volts with key removed, and battery voltage with key inserted. If both voltages are okay, go to next step. If either voltage is not as specified, inspect yellow/red wire for continuity, and inspect fuse "M". If okay, go to step 10).
  5. Check key detention switch input signal: Turn ignition OFF and set gear selector lever in "P" and release selector lever button. Measure voltage between control unit conector terminal 12 (Blue/White wire) and ground. See WIRING DIAGRAMS  . Voltage should be 0 Volts. Turn ignition ON, depress brake pedal, push selector lever button and recheck. Voltmeter should read battery voltage. Release brake and move gear selector lever out of "P". Voltmeter should read battery voltage in any position other than "P". If any voltage is not as specified, go to step 11). If all voltages are as specified, go to next step.
  6. Check key lock output signal: With ignition OFF and selector lever in "P", measure voltage between shift lock solenoid connector terminal 8 (Light Green/Red wire) and ground. See WIRING DIAGRAMS  . As ignition switch is turned from OFF to ON, battery voltage should be present for approximately 0.1 seconds. If voltage is as specified, go to next step. If voltage is not as specified, check light green/red wire for continuity between shift lock solenoid and shift lock control unit. Repair as necessary. If wire and connectors are okay, replace control unit.
  7. Check key unlock output signal: Place gear selector lever in "P". With ignition OFF, check voltage between key detention switch connector terminal 10 (Light Green/Black wire) and ground. See WIRING DIAGRAMS  . As ignition switch is turned from OFF to ON, battery voltage should be present for approximately 0.1 seconds. If voltage is as specified, go to next step. If voltage is not as specified, check light green/black wire for continuity between shift lock solenoid and shift lock control unit. Repair as necessary. If wire and connectors are okay, replace control unit.
  8. Check key detention switch unlock output signal: Depress and hold selector lever button and brake pedal while turning ignition OFF. Check voltage between key lock solenoid connector terminal 10 (Light Green/Black wire) and ground. See WIRING DIAGRAMS  . As selector lever button is released, battery voltage should be present for approximately 0.1 seconds. If voltage is as specified, go to next step. If voltage is not as specified, replace control unit.
  9. Inspect key lock solenoid: Disconnect key lock solenoid connector. Verify operation of solenoid by applying battery voltage to key lock solenoid terminal 10 (Light Green/Black wire) and battery ground to terminal 8 (Light Gree/Red wire). See WIRING DIAGRAMS  . Replace solenoid if it cannot be heard operating. Reconnect key lock solenoid connector and turn ignition on. Now check for normal key lock operation. If key lock system still does not operate properly, inspect system connectors, and see CONTROL UNIT INSPECTION  table.
  10. Inspect key switch (located on ignition switch): Disconnect 3-pin key switch connector and check for continuity, on switch side of connector, between terminals 4 (Red/White wire) and 11 (Yellow/Red wire). See WIRING DIAGRAMS  . There should be continuity with key inserted, and not continuity with key removed. Replace switch if resistance is not as specified.
  11. Inspect key detent switch (located at base of selector lever): Disconnect shift lock solenoid connector and check for continuity, on switch side of connector, between terminals 12 (Blue/White wire) and 11 (Yellow/Red wire). See WIRING DIAGRAMS  . There should be continuity with selector lever in "P", or any position except "P" with selector lever button depressed. There should be no continuity when conditions are except as above. Replace switch if resistance is not as specified.
scientia non olet · About LEMON Manuals