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.
1995 Mazda 929FACTORY OEM SERVICE PROCEDURE
Keyless Entry System Inoperative
- Check 15-amp ROOM fuse. If fuse is blown, replace fuse (repair wiring as necessary). If fuse is okay, replace transmitter battery. See TRANSMITTER SERVICING . Press LOCK or UNLOCK button. If doors lock/unlock, discard old battery.
- If doors do not lock/unlock, open trunk and located keyless unit 4-pin electrical connector. Measure voltage at Blue/Red wire terminal of keyless unit connector. If battery voltage is not present, repair Blue/Red wire between 15-amp ROOM fuse and keyless unit.
- If battery voltage is present, disconnect keyless unit connector. Check continuity between ground and Black wire terminal of keyless unit connector. If continuity does not exist, repair Black wire between keyless unit and ground. If continuity exists, reconnect keyless connector and go to next step.
- Measure voltage at terminals 1P (Purple wire) and 2I (Red/Green wire) of CPU connectors. SeeFig 1 . If 5 volts is not present at both terminals, check CPU. See CENTRAL PROCESSING UNIT (CPU) under COMPONENT TESTING. If 5 volts is present at both terminals, go to next step.
- Measure voltage at Purple wire and Red/Green wire of keyless unit connector. If 5 volts is not present at both terminals, repair Purple wire and/or Red/Green wire between keyless unit and CPU. If 5 volts is present at both terminals, go to next step.
- Replace transmitter and change transmitter ID code. See TRANSMITTER SERVICING . If keyless entry system operates, discard old transmitter. If keyless entry system does not operate, replace keyless unit. See KEYLESS UNIT R & I under REMOVAL & INSTALLATION.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.