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The HDT can be used to see what conditions turn on the warning lights in non-J1708
gauges. (The information in this section is presented as additional information not
necessary to the operation of the HDT or to the servicing of the vehicle).
1. With the ignition off, connect the HDT to the vehicle's diagnostic connector using
the appropriate adapter as shown in Figure 6-2. The diagnostic connector is usu-
ally located under the dash on the driver's side.
2. Turn the ignition on. The HDT will look for the Interface Module and try to es-
tablish communications with it while displaying:
Typically, this takes less than 30 seconds but can take up to 2 minutes.
a.
If communications are established, the HDT will display:
b. If communications are not established after 2 minutes, repeat this proce-
dure starting at Step 1 with the ignition off. If the HDT fails to establish
communications after three attempts, there may be a problem with the
J1708 data bus. In this case, choose the symptom from Chapter 5 that best
describes the original instrument system failure and follow the trouble-
shooting procedures.
3. After communications are established, read the configuration data by pressing
the Select key. The HDT will display:
a.
If the HDT reads the configuration data successfully, it will display:
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