Condition Present:

86/87 ELDORADO/SEVILLE:

87 -90 ALLANTE:

88/89 ELDORADO/SEVILLE:

90 ELDORADO/SEVILLE:

This section explains how to find the cause of a data line condition that is present all the time or can be duplicated for diagnosis. Using the instructions in this section, perform the appropriate "condition present diagnosis" trouble tree.

The condition present diagnosis charts have many branches that instruct to check for voltage/ground on the 800 circuit. First, check for voltage at the specified pin with the ignition on (there should be less than .1 volts). If there is no voltage, check the circuit for resistance to ground (should read open to ground on the highest resistance setting). The trouble trees are written so that whenever these checks are made the right components are connected/disconnected to prevent false readings. Therefore, do not reconnect components until instructed to do so or when diagnosis is completed.

If the voltage/resistance test indicates there is a problem in part of the 800 circuit, check that section of the 800 circuit by tracing the wire and checking connections in that segment. Refer to page 8A-50-0 in the Service Information Manual for circuit layout. If the circuit is difficult to trace or no problem in the circuit is visible, it may be better to restring the segment involved. If this segment includes the flex circuits behind the IPC on E/K models, isolate the problem to the wiring up to C201 or a C201/flex circuit problem. If the problem is in connector C201 or the flex circuits, the entire carrier must be replaced.
NOTE: Data line conditions tend to be intermittent and may disappear while disconnecting/ reconnecting components. Therefore, double check each step of the trouble tree to make sure the conditions have not disappeared during testing. If they have disappeared, return to the last step taken while the condition was present and continue when condition returns. If the condition cannot be duplicated again or the condition present diagnosis does not lead to the fix, perform the condition not present diagnosis.