GMC 24229422 Switch,Parking/Neutral Position & Back Up Lamp

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For 1995 and earlier models, ensure the engine starts only in Park or Neutral. The switch is at the steering column's bottom. Set the parking brake and selector in Neutral. Rotate the switch to Low, then to Park to set correctly. If malfunctioning, replacement might be needed. For removal, set to Neutral, disconnect electrical connectors, and spread tangs to pull out the switch. For installation, align the tang with the shift tube hole, press onto the column, and adjust. For 1996 and later, apply the brake, set to Neutral, disconnect the battery, and raise the vehicle. Remove the lever, connector, and switch retaining bolts. File burrs on the shaft if found. Install using an adjustment tool, align switch hub flats, secure with bolts, install the lever, and test the switch.

To check the Park/Neutral switch, first, ensure that it prevents the engine from starting in any gear other than Park or Neutral. Raise the vehicle and securely place it on jack stands, then unplug the electrical connector from the Park/Neutral switch. Use an ohmmeter to check continuity across the indicated switch terminals. There should be continuity with the shift lever in Park or Neutral, and no continuity in any other position. If the switch doesn't operate as described, try adjusting it before retesting, and if it still fails, replace it. For removal, apply the parking brake, place the shift lever in Neutral, disconnect the battery cable, raise the vehicle on jack stands, remove the nut and manual lever, unplug the electrical connector from the switch, and remove the switch retaining bolts. Slide the switch off the manual shaft. Installation involves using a special adjustment tool, aligning the switch with the manual shaft flats, sliding it onto the manual shaft, and securing it with mounting bolts. Remove the adjustment tool and complete the remaining installation steps, tightening the manual lever retaining nut to the specified torque.

Either a clutch interlock switch (manual transmission-equipped models) or a neutral safety switch (automatic transmission equipped models) is used for the neutral safety switch on these models. The engine won't crank if it's fitted with a clutch interlock switch unless the clutch is pressed. An engine with neutral safety switch can not be cranked unless the gear selector is in either park or neutral. In case of an automatic transmission vehicle, try to start it up while changing gears. It should only crank in either neutral or park. If however it starts when on any other gear then its' neutral safety switch might be faulty or need adjustment. When this happens, locate and place the shift lever in "neutral" if your car has a manual transmission. The engine will only crank when the pedal is depressed. If it cranks before you press down the pedal, this switch located near the top of the clutch pedal arm may be defective. For automatic transmissions make sure that the steering column lock allows the key to go into Lock position only when shifter lever is put on Park position. The ignition key should come out only in Lock position.

Various engine sensors and components have checking procedures,the engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can cause trouble codes. The resistance should be measured when cold and warm while ensuring reference voltage from PCM is around 5.0 volts for the verification. Manifold Absolute Pressure (MAP) Sensor monitors changes in intake manifold pressure then varies its voltage output accordingly. Look at the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. Intake Air Temperature (IAT) Sensor acts as a thermistor where you can measure its resistance at different temperatures to make sure it changes as expected. Also, use a scan tool to monitor the IAT sensor for performance. The oxygen sensor in exhaust detects oxygen content which you can check its millivolt signal while warming up your engine. Check whether the oxygen sensor heater has correct voltage or not. Vehicle Speed Sensor (VSS) provides speed data to PCM which can be checked for reference voltage. Depending on the type of engine, Camshaft Sensor and Crankshaft Sensor should be checked for resistance and proper signal output. Finally, Knock Sensors detect engine knock which should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

The intake air temperature (IAT) sensor acts as a thermistor. To check it, you can measure its resistance at different temperatures to ensure it changes as expected. Additionally, you should monitor the IAT sensor using a scan tool to verify its performance.

The ignition key should come out only in the Lock position.

Firmly apply the parking brake and set the shift lever to Neutral. Pry the shift cable from the transmission shift lever ball-stud, remove the nut retaining the shift lever to the shaft, and take off the lever. Disconnect the electrical connector, remove the mounting bolts, and slide the switch off the shaft. Lightly file the shaft's end if needed. To install the switch with the shaft still in Neutral, align the switch's flats with those on the shaft, lower the switch onto the shaft, and install the bolts. Adjust the switch's alignment by moving it as necessary. Reinstall the shift lever and cable, verify starting in Park and Neutral, and adjust further if needed by loosening the mounting bolts and rotating the switch slightly until it functions correctly.

Remove the manual lever retaining nut and remove the manual lever from the manual shaft.

The two types of starter safety switches used on these models are the clutch interlock switch for manual transmission-equipped models and the neutral start switch for automatic transmission-equipped models.

Firmly apply the parking brake and set the shift lever to Neutral. Pry the shift cable from the transmission shift lever ball-stud, remove the nut retaining the shift lever to the shaft, and take off the lever. Disconnect the electrical connector, remove the mounting bolts, and slide the switch off the shaft. Lightly file the shaft's end if needed. To install the switch with the shaft still in Neutral, align the switch's flats with those on the shaft, lower the switch onto the shaft, and install the bolts. Adjust the switch's alignment by moving it as necessary. Reinstall the shift lever and cable, verify starting in Park and Neutral, and adjust further if needed by loosening the mounting bolts and rotating the switch slightly until it functions correctly.

If the Park/Neutral switch doesn't operate as described for 1994 models, it should be replaced.

The ignition key should come out only in the Lock position.

If the Park/Neutral switch doesn't operate as described for 1994 models, it should be replaced.

Try to start the engine in each gear.

For 1996 and later models, removal requires applying the parking brake, placing the gear selector in Neutral, disconnecting the battery cable, raising the vehicle, removing the lever from the manual lever shaft.

The ignition key should come out only in the Lock position.

For 1995 and 1996 models, raise the vehicle and securely place it on jack stands, then unplug the electrical connector from the Park/Neutral switch. Use an ohmmeter to check continuity across the indicated switch terminals. There should be continuity with the shift lever in Park or Neutral, and no continuity in any other position, except for Reverse, where continuity is expected for the backup lights.

The manifold absolute pressure (MAP) sensor monitors intake manifold pressure changes and varies its voltage output accordingly. To check it, you should check the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes.

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