Acura 3.5 RL Manual page 1217

Rear Window Defogger
Control Unit Input Test (cont'd)
NOTE: Before testing, go to the Troubleshooting Guide (see page 23-244). Be sure to go through self-diagnosis function
modes 1 and 2 (see pages
Multiplex Control Unit (Driver's):
1. Remove the under-dash fuse/relay box (see page 23-66).
2. Remove the driver's unit from the under-dash fuse/relay box (see page 23-247).
3. Inspect the connector and socket terminals to be sure they are all making good contact.
• If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, make the following input tests at the connector and the fuse/relay box socket.
If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, the control unit must be faulty; replace it.
Cavity Wire
Under all conditions
A8
Fuse/relay
Ignition switch ON (II)
box socket
A13
23-248 and 23-252).
Fuse/relay
box socket
Test condition
Check for continuity to ground:
There should be continuity
Check for voltage to ground:
There should be battery voltage.
Test: Desired result Possible cause if result is not obtained
• Poor ground (G401, G402 or G251)
• An open in the wire
• Blown No. 13 (7.5 A) fuse in the
under-dash fuse/relay box
• An open in the wire