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Shift Interlock Systems: Diagnosis Oldsmobile Bravada III

Automatic Trans ~1432 words

DIAGNOSTIC STARTING POINT

Begin the system diagnosis by reviewing DESCRIPTION & OPERATION . Reviewing the description and operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the description and operation information will also help you determine if the condition described by the customer is normal operation. See SYMPTOM DIAGNOSIS in order to identify the correct procedure for diagnosing the system and where the procedure is located.

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the shift lock control system. Inspect easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. Park Lock Solenoid Inoperative
  2. Shift Lever Does Not Move With Brake Pedal Depressed
  3. Shift Lever Can Be Moved Without Brake Pedal Depressed

See appropriate test under SYMPTOM TESTS .

SYMPTOM TESTS

CAUTIONUse caution when probing fuses or junction blocks, or any connectors. Damage may result to connector or terminal if probe being used is too large. Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.
SymptomTest
Park Lock Solenoid InoperativeA
Shift Lever Does Not Move With Brake Pedal DepressedB
Shift Lever Can Be Moved Without Brake Pedal DepressedC

SYMPTOM TEST INDEX

TEST A: PARK LOCK SOLENOID INOPERATIVE

Note. For circuit reference, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

  1. Did you review the DESCRIPTION and OPERATION and perform the necessary inspections? If so, go to next step. If not, see «DESCRIPTION & OPERATION»(ref-139895-S41180874242002051000000) .
  2. Place the gearshift lever in the Park position. Turn ignition switch to the OFF position. Depress the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to next step. If not, check for intermittent condition. See «SYMPTOM DIAGNOSIS»(ref-139895-S15044073612002051000000) under TROUBLE SHOOTING.
  3. Connect a test light between ground and the park lock solenoid ignition feed circuit (Light Green/Black wire). Does the test light illuminate? If so, go to step 5 . If not, go to next step.
  4. Inspect the park lock solenoid for poor connections. Did you find and correct the condition? If so, go to step 7 . If not go to step 6 .
  5. Repair the short to battery voltage in the park lock solenoid ignition feed circuit (Light Green/Black wire). After repairs, go to step 7 .
  6. Replace the park lock solenoid. See «FLOOR SHIFT CONTROL ASSEMBLY»(ref-139895-S31950872512002051100000) under REMOVAL & INSTALLATION. After repairs, go to next step.
  7. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step 2 .

TEST B: GEARSHIFT LEVER DOES NOT MOVE WITH BRAKE PEDAL DEPRESSED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

  1. Did you review the DESCRIPTION and OPERATION and perform the necessary inspections? If so, go to next step. If not, see «DESCRIPTION & OPERATION»(ref-139895-S41180874242002051000000) .
  2. Turn the ignition switch to the ON position. Press and hold the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, concern is intermittent. See «SYMPTOM DIAGNOSIS»(ref-139895-S15044073612002051000000) under TROUBLE SHOOTING. If not, go to next step.
  3. Turn the ignition switch to the OFF position. Disconnect the stoplamp switch. Turn the ignition switch to the ON position. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to step 7 . If not, go to next step.
  4. Turn the ignition switch to the OFF position. Leave the stoplamp switch disconnected. Connect a test light between ground and the shift lock solenoid voltage supply circuit (Dark Green/White wire). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to step 10 . If not, go to next step.
  5. Turn the ignition switch to the OFF position. Connect a test light between ground and the park lock solenoid ignition feed circuit (Light Green/Black wire). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step 9 .
  6. Turn the ignition switch to the OFF position. Connect a test light between the ground circuit (Black wire) and the ignition feed circuit (Light Green/Black wire) at the park lock solenoid. Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to step 8 . If not, go to step 11 .
  7. Inspect the stoplamp switch for poor connections. Did you find and correct the condition? If so, go to step 14 . If not, go to step 13 .
  8. Inspect the park lock/shift lock solenoid assembly for poor connections. Did you find and correct the condition? If so, go to step 14 . If not go to step 12 .
  9. Repair the park lock solenoid ignition feed circuit (Light Green/Black wire) for an open or high resistance. After repairs, go to step 14 .
  10. Repair the shift lock solenoid voltage supply circuit (Dark Green/White wire) for a short to battery voltage. After repairs, go to step 14 .
  11. Repair the park lock solenoid ground circuit (Black wire) for an open or high resistance. After repairs, go to step 14 .
  12. Replace the park lock/shift lock solenoid assembly. See «FLOOR SHIFT CONTROL ASSEMBLY»(ref-139895-S31950872512002051100000) under REMOVAL & INSTALLATION. After repairs, go to step 14 .
  13. Replace the stoplamp switch. See «STOPLAMP SWITCH»(ref-139895-S14746126912002051000000) under REMOVAL & INSTALLATION. After repairs, go to next step.
  14. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step 2 .

TEST C: GEARSHIFT LEVER CAN BE MOVED WITHOUT BRAKE PEDAL DEPRESSED

Note. For circuit reference, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

  1. Did you review the DESCRIPTION and OPERATION and perform the necessary inspections? If so, go to next step. If not, see «DESCRIPTION & OPERATION»(ref-139895-S41180874242002051000000) .
  2. Apply the parking brake and block the wheels. Turn the ignition switch to the ON position. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to next step. If not, condition is intermittent. See «SYMPTOM DIAGNOSIS»(ref-139895-S15044073612002051000000) .
  3. Turn the ignition switch to the OFF position. Press and hold the brake pedal. Attempt to move the gearshift lever out of the Park position. Does the gearshift lever move out of the Park position? If so, go to next step. If not, go to step 5 .
  4. Test the park lock solenoid ignition feed circuit (Light Green/Black wire) for a short to battery voltage. Did you find and correct the condition? If so, go to step 14 . If not, go to step 8 .
  5. Connect a test light between ground and the stoplamp switch voltage supply circuit (Light Green/Black wire). Turn the ignition switch to the ON position. Does the test light illuminate? If so, go to next step. If not, go to step 11 .
  6. Turn the ignition switch to the OFF position. Connect a test light between ground and the stoplamp switch voltage supply circuit (Light Green/Black wire). Turn the ignition switch to the ON position. Press and release the brake pedal several times. Does the test light turn ON and OFF with the brake pedal? If so, go to next step. If not, go to step 9 .
  7. Turn the ignition switch to the OFF position. Connect a test light between ground and the shift lock solenoid voltage supply circuit (Dark Green/White wire). Turn the ignition switch to the ON position. Press and release the brake pedal several times. Does the test light turn ON and OFF with the brake pedal? If so, go to next step. If not, go to step 10 .
  8. Inspect the park lock/shift lock solenoid assembly for poor connections. Did you find and correct the condition? If so, go to step 14 . If not, go to step 13 .
  9. Inspect the stoplamp switch for poor connections. Did you find and correct the condition? If so, go to step 14 . If not, go to step 12 .
  10. Repair the open in the shift lock solenoid voltage supply circuit (Dark Green/White wire). After repairs, go to step 14 .
  11. Repair the open in the stoplamp switch ignition feed circuit (Light Green/Black wire). After repairs, go to step 14 .
  12. Replace the stoplamp switch. See «STOPLAMP SWITCH»(ref-139895-S14746126912002051000000) under REMOVAL & INSTALLATION. After repairs, go to step 14 .
  13. Replace the shift lock solenoid. See «FLOOR SHIFT CONTROL ASSEMBLY»(ref-139895-S31950872512002051100000) under REMOVAL & INSTALLATION.
  14. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to step 2 .

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