RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 6 (1998)
Radio/Stereo Noise Filter Relay: Testing and Inspection
The filter, choke, and speaker relay is used to switch power to the individual speaker amplifiers used with the Infinity premium speaker package. The
choke and relay are serviced only as a unit. If the front door speakers lack bass or low frequency response, while no sound is noted at the
Infinity-amplified tweeters in the A-pillar garnish mouldings, the choke and relay should be considered suspect. However, before replacement make the
following checks of the choke and relay circuits.
1. Check the fuse in the junction block. If OK, go to Step 2. If not OK, replace the faulty fuse.
2. Check for battery voltage at the fuse in the junction block. If OK, go to Step 3. If not OK, repair the open circuit as required.
3. Unplug the choke and relay wire harness connector. Check for battery voltage at the fused B(+) circuit cavity of the choke and relay wire harness
connector. If OK, go to Step 4. If not OK, repair the open circuit as required.
4. Probe the ground circuit cavity of the choke and relay wire harness connector. Check for continuity to a good ground. There should be continuity.
If OK, go to Step 5. If not OK, repair the open circuit to ground as required.
5. Turn the ignition switch to the On position and turn the radio on. Check for battery voltage at the radio 12-volt output circuit cavity of the choke
and relay wire harness connector. If OK, go to Step 6. If not OK, repair the open circuit as required.
6. Turn the radio and ignition switches to the Off position. Plug in the choke and relay wire harness connector. Check for battery voltage at the
amplified speaker (+) circuit cavity of the choke and relay wire harness connector. There should be zero volts. Turn the ignition and radio
switches to the On position. There should now be battery voltage. If OK, repair the circuits from the choke and relay wire harness connector to the
speaker amplifiers as required. If not OK, replace the faulty choke and relay.
