Locating the OBD2 port in your 1998 Jetta is crucial for diagnosing car problems using a scan tool. This port, also known as the Diagnostic Link Connector (DLC), allows mechanics and car owners to access the vehicle’s computer system to read error codes and assess the health of various components. If you’re looking to troubleshoot a check engine light or perform routine diagnostics, finding the OBD2 location is your first step.
For a 1998 Volkswagen Jetta, the OBD2 port is typically found inside the cabin. You’ll want to check in the area under the dashboard on the driver’s side. Specifically, it’s often situated near the fuse box.
Speaking of fuses, if you’re experiencing issues connecting to the OBD2 port with your scan tool, a common culprit is a blown fuse. According to the MKIV Jetta fuse list, Fuse 12 in the top section of the fuse box is dedicated to the Data Link Connector (DLC) power supply. This 7.5 amp fuse is essential for providing power to your OBD2 port.
It’s always a good idea to check this fuse if you suspect a problem with your OBD2 connection. Sometimes, fuses can appear visually intact but still be faulty. Replacing Fuse 12, even if it looks okay, is a simple first step in troubleshooting OBD2 communication issues.
To further assist with your Jetta’s electrical system and potential diagnostic checks, here is a comprehensive MKIV fuse list:
MKIV Fuse List
Top Section (Left to Right, Column by Column)
- Washer nozzle heaters, glove compartment light, memory seat control module (10A)
- Turn signal lights (10A)
- Fog light relay, instrument panel light dimmer switch (5A)
- License plate light (5A)
- Comfort system, cruise control, Climatronic, A/C, heated seat control modules, automatic day/night interior mirror, control module for multi-function steering wheel, control unit in steering wheel (7.5A)
- Central locking system (5A)
- Back-up lights, speedometer vehicle speed sensor (VSS) (10A)
- Open
- Anti-lock brake system (ABS) (5A)
- Engine control module (ECM): gasoline engine (10A); diesel engine, Model Year 2000 > (5A)
- Instrument cluster, shift lock solenoid (5A)
- Data Link Connector (DLC) power supply (7.5A)
- Brake tail lights (10A)
- Interior lights, central locking system (10A)
- Instrument cluster, transmission control module (TCM) (5A)
- A/C clutch, after-run coolant pump (10A)
- Open
- Headlight high beam, right (10A)
- Headlight high beam, left (10A)
- Headlight low beam, right (15A)
- Headlight low beam, left (15A)
- Parking lights right, side marker right (5A)
- Parking lights left, side marker left (5A)
Bottom Section (Left to Right, Columns)
- Windshield and rear window washer pump, windshield wiper motor (20A)
- Fresh air blower, Climatronic, A/C (25A)
- Rear window defogger (25A)
- Motor for rear windshield wiper (15A)
- Fuel pump (FP) (15A)
- Engine control module (ECM) gasoline engine (15A); diesel engine (10A)
- Power sunroof control module (20A)
- Transmission control module (TCM) (20A)
- Injectors: gasoline engine (10A); diesel engine (15A)
- Headlight washer system (20A)
- Open
- Engine control elements (10A)
- 12 V power outlet (in luggage compartment) (30A)
- Fog lights (15A)
- Terminal (86S) on radio, Instrument cluster (10A)
- Central locking system (with power windows), luggage compartment light, remote/fuel tank door, motor to unlock rear lid (15A)
- Emergency flashers (15A)
- Dual tone horn (20A)
- Cigarette lighter (15A)
- Radio (25A)
- Engine control elements (10A)
- Heated seats (15A)
Fuse Arrangements in Fuse Bracket/Battery:
S162. Glow plugs (coolant) (50A)
S163. Fuel pump (FP) relay/glow plug relay (50A)
S164. Coolant fan control (FC) control module/coolant fan (40A)
S176. Relays panel interior (110A)
S177. Generator (GEN) (90 Amp.) (110A). Generator (GEN) (120 Amp.) (150A)
S178. ABS (hydraulic pumps) (30A)
S179. ABS (30A)
S180. Coolant fan (30A)
By understanding the OBD2 location and the function of Fuse 12, along with having access to the complete fuse list, you are better equipped to maintain and diagnose your 1998 Jetta. This information can save you time and potentially money when addressing electrical or diagnostic issues with your vehicle.
