Jeep Wrangler (JL) (2018 - )

Electronic diagnostics

NOTICE: exact coverage may vary between vehicles. Please view this preview to check your job is included.

A world-leading diagnostics application, now available for DIYers

• Wiring diagrams for engine management, ABS, ESP and air conditioning
• Retrieve data from the vehicle’s engine management/ CAN-Bus system to diagnose faults and component errors which have generated fault codes
• Enter fault codes and see their description with suggested components to test

• Comfort Wiring Diagrams

  • Clear, “localised” wiring schematics for key vehicle features, with wire and component trace functionality for fast, efficient, first-time fixes.
  • Includes pan and zoom functionality
  • Highlight feature to trace corresponding wires and components
  • Includes:
    • Air conditioning
    • Central locking
    • Exterior lights
    • Horn
    • Instrument cluster
    • Power windows
    • Starting/charging
    • Supplemental restraint system (SRS)/Airbag
    • Wash/wipe system

• Fuse locations

  • Fully illustrated guide to locating each fuse

• Warning lights

  • Complete guide to every common warning light and how to respond

Introducing the new Haynes Manual for a new generation of vehicles. While the traditional Haynes Manual has been a DIY repair staple for over 60 years, today's modern vehicles pose new challenges that require a digital solution.

In the past, vehicles were simpler, and there were fewer models. Now, with over 100,000 variants, electronic systems are integral, and maintenance requires a different approach. Haynes recognized the need for change and embarked on a reinvention of the repair manual. Instead of step-by-step instructions, the new Haynes DIY incorporates workshop data and general DIY tutorials, suited for confident mechanics.

However, the game-changer is the addition of an electronics diagnosis module. Modern cars rely on sensors and control units, and diagnosing issues begins with plugging into the OBD system. Haynes' new tool allows DIY enthusiasts to enter fault codes, follow instructions to test components, and determine likely causes. This goes beyond regular fault code readers, empowering car owners to regain control over repairs. Even if not doing the repair themselves, they'll know the problem when seeking professional help.

It's important to note that Haynes Haynes DIY is distinct from a Haynes Manual, but it empowers countless vehicle owners to maintain and troubleshoot their cars in a DIY setting.

Note: Haynes DIY is a worldwide product. You will sometimes see RHD (right hand drive) or LHD (left hand drive) mentioned. On location diagrams, we sometimes have LHD drawings only; but they do apply to RHD vehicles in a mirror image.

The experts at Haynes have compiled 50+ tutorials on tasks that range from changing the oil to replacing a timing belt. Use these DIY friendly guides alongside the data for your vehicle to complete the job correctly first time.

Guides include tools needed, level of difficulty, common problems and expert tips. We’ll even suggest other jobs to take on in conjunction with the one you have chosen.

More content is added continually to ensure you are covered for every job!

In addition to comprehensive data, diagrams and written tutorials, a wide range of instructional videos are available to view. Understand your job quickly and learn the best way to tackle each one.

More content is added continually to ensure you are covered for every job!