Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1984HORIZON BASE, 1.6 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 20 (ENGINE CONTROLS - TESTS W/CODES - BODY CONTROL COMPUTER)SELF-DIAGNOSTIC TESTSTEST 35A - AUTO DOOR LOCK PROBLEM
1984 Plymouth Horizon Base, 1.6 A
Test 35A - Auto Door Lock Problem
1984 Plymouth Horizon Base, 1.6 ASECTION Test 35A - Auto Door Lock Problem
WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION
. For wiring diagrams, see WIRING DIAGRAMS
. Perform TEST VER-1 after each repair.
- If vehicle is equipped with Remote Keyless Entry (RKE) module, go to TEST 36A. See Fig 1 . If vehicle is not equipped with RKE module, close all doors. Open front windows and remove ignition key. Go to next step.
- Lock and unlock both front doors at door lock switches. If doors fail to lock or unlock properly, perform appropriate test listed in TEST 35A DIAGNOSTIC DIRECTORY table. If doors lock and unlock properly, go to next step.TEST 35A DIAGNOSTIC DIRECTORY
Problem Perform Test No. All Doors Fail To Lock & Unlock From Any Switch TEST 35B One Door Fails To Lock & Unlock From Any Switch TEST 35D All Doors Fail To Lock & Unlock From One Switch TEST 35E Doors Fail To Lock From Any Switch TEST 35F Doors Fail To Lock From One Switch (1) * Doors Fail To Unlock From Any Switch TEST 35H Doors Fail To Unlock From One Switch (1) * (1) Replace defective switch. - Turn ignition switch to OFF position. Leave key in ignition switch. Open left front door. Lock doors from any switch. If doors lock, go to TEST 35J . If doors do not lock, go to next step.
- If vehicle is equipped with speed sensitive locks, drive vehicle with all doors closed. Reach a vehicle speed above 15 MPH. If doors do not lock, go to TEST 35K . If doors lock, system is operating properly at this time.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.