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.
1999 Mercedes Benz ML430FACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Splices
SPLICES
| Component | Component Location |
|---|---|
| Z3/29a | In motor harness, under plastic harness channel. |
| Z3/29 | In motor harness, left side of engine, under plastic harness channel. |
| Z3/29 | In motor harness, left rear of engine compartment. |
| Z3/29b | In motor harness, in "E" box. |
| Z7/5 | In motor harness, left rear of engine compartment. |
| Z7/35 | In motor harness, left side of engine, under plastic harness channel. |
| Z7/35a | In motor harness, left side of engine, under plastic harness channel. |
| Z7/35b | In motor harness, left side of engine, under plastic harness channel. |
| Z7/36 | In motor harness, left side of engine, under plastic harness channel. |
| Z50/1 | In dash harness, behind instrument cluster, near breakout for instrument cluster connector. |
| Z50/2 | In dash harness, center, near breakout for A/C control module. |
| Z50/3 | In dash harness, in breakout harness for passenger harness to dash harness interconnect. |
| Z50/4 | In dash harness, right side, near breakout for icing sensor. |
| Z50/5 | In dash harness, behind instrument cluster, between breakouts for parking brake switch & stoplamp switch. |
| Z50/6 | In dash harness, behind instrument cluster. |
| Z50/10 | In dash harness, behind instrument cluster. |
| Z50/11 | In dash harness, behind instrument cluster. |
| Z50/12 | In dash harness, behind instrument cluster |
| Z50/13 | In dash harness, in breakout harness for passenger harness to dash harness interconnect. |
| Z50/14 | In dash harness, near breakout for parking brake switch. |
| Z50/16 | In dash harness, near breakout for parking brake switch. |
| Z50/17 | In dash harness, near breakout for parking brake switch. |
| Z50/18 | In dash harness, near breakout for parking brake switch. |
| Z51/1 | In passenger harness, under center of dash, between breakouts for kickdown switch & N15/3. |
| Z51/2 | In passenger harness, under center of dash, between breakouts for kickdown switch & N15/3. |
| Z51/3 | In passenger harness, left side of engine compartment, in "E" box. |
| Z51/4 | In passenger harness, left side of engine compartment, in "E" box. |
| Z51/5 | In passenger harness, under front of center console, near breakout for radio & SRS control module. |
| Z51/6 | In passenger harness, under center console, in harness breakout for transmission range recognition switch. |
| Z51/7 | In passenger harness, under center console, in harness breakout for center console switch assembly. |
| Z51/8 | In passenger harness, under passenger's side of dash. |
| Z51/9 | In passenger harness, under left front seat, near breakout for W18. |
| Z51/10 | In passenger harness, in breakout for left front seat adjustment auxiliary fuse. |
| Z52/1 | In passenger harness, under right front seat, near breakout for W19. |
| Z52/2 | In passenger harness, left rear of vehicle, near breakout for trailer connector X52. |
| Z52/4 | In passenger harness, under center console, in main harness breakout for right side of vehicle. |
| Z52/5 | In passenger harness, left rear of vehicle, near breakout for tailgate harness. |
| Z52/6 | In passenger harness, left rear of vehicle, near breakout for tailgate harness. |
| Z52/7 | In passenger harness, left side of engine compartment, in "E" box. |
| Z52/9 | In passenger harness, under center console, in main harness breakout for right side of vehicle. |
| Z52/10 | In passenger harness, in harness breakout for dash connector X18. |
| Z52/11 | In passenger harness, in harness breakout for dash connector X18. |
| Z53/1 | In passenger harness, under center console, in main breakout for left side of vehicle. |
| Z53/2 | In passenger harness, under center console, in main breakout for left side of vehicle. |
| Z53/3 | In passenger harness, under center console, in main breakout for left side of vehicle. |
| Z53/4 | In passenger harness, left rear of cargo area, near breakout for trailer connector. |
| Z53/5 | In passenger harness, under center console, in main harness breakout for right side of vehicle. |
| Z53/6 | In passenger harness, left rear of cargo area, near breakout for trailer connector X52. |
| Z53/7 | In passenger harness, in harness breakout for dash connector X18. |
| Z53/8 | In passenger harness, under center console, in main breakout for right side of vehicle. |
| Z53/9 | In passenger harness, under center console in plastic harness channel. |
| Z54/1 | Headliner harness, near breakout for left rear dome lamp. |
| Z54/2 | Headliner harness, near breakout for sliding/pop-up roof assembly. |
| Z54/3 | Headliner harness, near breakout for sliding/pop-up roof assembly. |
| Z54/5 | Headliner harness, in breakout harness to rear dome lamp. |
| Z55/1 | Tailgate harness, in breakout for W8 & trunk lid microswitch. |
| Z55/2 | Tailgate harness, near breakout for tailgate CL actuating motor, rear wiper motor & license plate lamps. |
| Z56/1 | Lower left front of engine compartment, behind headlamp. |
| Z56/2 | Lower left front of engine compartment, behind headlamp. |
| Z56/4 | Lower left front of engine compartment, behind headlamp. |
| Z57/1 | Lower right front of engine compartment, behind headlamp. |
| Z57/2 | Left side of engine compartment, in "E" box. |
| Z57/3 | Right engine harness, near breakout for wiper motor. |
Factory Service Tools
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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.