DTC Troubleshooting: B1906
  1. Check for continuity between the gauge control module (tach) 36P connector No. 15 and No. 16 terminals and body ground.
Are there continuity?
YES -
Go to Step 16 .
NO -
Repair an open in the wire or poor ground (G502, G503).■
  1. Disconnect the under-dash fuse/relay box connector Q (16P).