HYUNDAI & KIA SERVICE INFORMATION: TSBs, CAMPAIGNS, WIRING DIAGRAMS, J2534 TOOLS & VARIANT CODING

KEY TAKEAWAYS

Accessing OEM Service Information

Christian demonstrated how to navigate HyundaiTechInfo.com and KiaTechInfo.Snapon.com, covering what each subscription level includes — from service manuals and ETMs (wiring diagrams) to TSBs, DTC charts, campaigns, and component descriptions. He also explained differences between the Hyundai and Kia J2534 tools, noting Kia’s diagnostic tool tends to run smoother and supports a wider range of functions for newer models.

TSBs, Campaigns & Warranty Extensions

TSBs and campaigns are organized differently on each site.
Christian walked attendees through:

• How to find the most recent TSB supersession
• Why outdated bulletins may fail to load
• How campaigns can be superseded multiple times
• Where warranty extensions appear inside TSB documents

One example showed a high-pressure fuel pump warranty extension lasting 15 years / 180,000 miles — a repair that could be free for the customer if the vehicle still qualifies.

Interactive Wiring Diagrams (ETM)

Hyundai and Kia wiring diagrams are fully interactive and link directly to:

• Connector views (female/male)
• Exact connector locations on the vehicle
• Harness routing paths
• Joint connectors, pinouts and CAN topology

Christian highlighted how these diagrams help technicians quickly isolate harness issues, locate missing segments after collision damage or rodent repair, and confirm fuse-to-component voltage paths.

He also pointed out that Hyundai/Kia DLC pin numbering is inverted compared to generic OBD diagrams — a common source of misdiagnosis.

DTC Charts & Testing Information

Using an example fuel level sensor fault (P0461), Christian demonstrated how Hyundai and Kia service sites provide:

• Component descriptions
• DTC detection logic
• Test specifications
• Direct links to the wiring diagrams
• Expected resistance values at different fuel levels

These charts give technicians a complete diagnostic workflow without leaving the OEM site.

J2534 Reprogramming & Diagnostic Tools

Christian explained the difference between Hyundai/Kia J2534 Reprogramming Software (ECM/TCM only) and J2534 Diagnostic Software (module communication, coding review, etc.).

Key points included:

• Always verify ROM IDs with the TSB before flashing
• Incorrect ROM selection can corrupt modules
• Reprogramming requires a stable voltage (13.6V recommended)
• ROM ID checks can take 15–20 minutes
• Some modules allow coding backup — but technicians should still photograph coding before replacement

The J2534 diagnostic tool can display and edit module variant coding, check system scans, and review module information by VIN.

Variant Coding: Hyundai & Kia

Variant coding was one of the most requested topics.

Christian covered:

• Where to find variant coding in Hyundai’s Vehicle Info tab
• How Kia’s dedicated Variant Coding section works
• Why only certain modules have coding listed online
• What to do when coding isn’t available on the service site

Most importantly: Technicians must save the original coding before replacing a module, as not all vehicles provide coding online. If the module was dead and coding cannot be retrieved, a dealer GDS/KDS session is required to code the replacement module.

Christian also demonstrated examples of coding failures such as DTC C1702, where re-entering proper variant coding restored communication.

Top Questions from Technicians

Attendees asked about:

• Differences between Hyundai and Kia J2534 capabilities
• Whether coding can be redone if entered incorrectly
• How to interpret superseded TSBs and campaigns
• Variants missing from Hyundai’s coding database
• When a dealer session is required for online coding
• Harness routing guidance for incomplete or rodent-damaged repairs
• DLC pin numbering and CAN topology differences
• Using detailed search to quickly locate connectors, TSBs or DTCs