Test 2A - Blank Scan Tool Message Screen
- Turn ignition off. Disconnect scan tool from Data Link Connector (DLC). Using an external ohmmeter, check for a good ground circuit in DLC. See DATA LINK CONNECTOR POWER & GROUND IDENTIFICATION table. If ground circuit is okay, go to next step. If ground circuit is not okay, repair as necessary. Perform TEST VER-1 .
- Turn ignition on. Using an external voltmeter, check for battery voltage in DLC, on wire identified in DATA LINK CONNECTOR POWER & GROUND IDENTIFICATION table. If battery voltage is not present, go to next step. If battery voltage is present, go to step 4).
- Check appropriate fuse identified in DATA LINK CONNECTOR FUSE IDENTIFICATION table. If fuse is blown, replace fuse. Perform TEST VER-1 . If fuse is not blown, inspect and repair wiring as necessary. Perform TEST VER-1 .
- Try a different scan tool cable. If scan tool screen is no longer blank, replace defective scan tool cable. Perform TEST VER-1 . If scan tool screen is still blank, try a different scan tool. If scan tool screen is no longer blank, replace defective scan tool. Perform TEST VER-1 .
DATA LINK CONNECTOR POWER & GROUND IDENTIFICATION
| Model |
Power Circuit |
Ground Circuit |
| Cherokee |
| PCM DLC |
Dark Blue/White |
Black/White |
| ABS DLC |
Pink/Light Green |
Black/Tan |
| Grand Cherokee |
| PCM DLC |
Light Blue/Red |
Black/Tan |
| ABS DLC |
Red/White |
Black |
| Wrangler |
| PCM DLC |
White/Yellow |
Black |
| ABS DLC |
Pink |
Black |
DATA LINK CONNECTOR FUSE IDENTIFICATION
| Model |
Location |
Fuse |
| Cherokee |
| PCM DLC |
Power Distribution Center |
No. 11 |
| ABS DLC |
Power Distribution Center |
No. 13 |
| Grand Cherokee |
| PCM DLC |
Power Distribution Center |
No. 5 |
| ABS DLC |
Power Distribution Center |
No. 13 |
| Wrangler |
| PCM DLC |
Fuse Block |
No. 5 |
| ABS DLC |
Fuse Block |
No. 12 |