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Possible Causes - Private bus is open between the Interface Module and the gauges;
Interface Module defective or not receiving power; defective gauge.
Procedure:
1. Connect the HDT to the diagnostic connector.
2. Switch the ignition on and verify that the HDT establishes a communications link
with the Interface Module.
a.
If communications are not established, follow the procedures in Figure 5-
16 on page 5-31 to determine the cause.
b. If communications are established, follow the procedures in Figure 5-17
on page 5-31.
3. If you have followed the procedures in Figure 5-17 and have not found the prob-
lem, one of the 2-inch gauges could be at fault. To find out which one:
a.
Disconnect the last gauge in the 5-wire cable daisy chain (it will have an
unused connector).
b. Switch the ignition on and see if the gauges still continue to sweep after
the initialization.
c.
If not, the disconnected gauge is defective. Replace it.
d. If the gauges continue to sweep, switch the ignition off, disconnect the
next to the last gauge in the daisy chain, switch the ignition back on and
observe the pointers.
e.
Repeat this process until all gauges except the SMC have been un-
plugged. If the problem goes away after unplugging a particular gauge,
then that gauge is defective and must be replaced.
f.
If the problem persists after unplugging all the gauges, replace the Inter-
face Module.
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