D: Speed Control Indicator Does Not Turn On

D1 Check Voltage At Speed Control Servo Assembly Connector
- Disconnect 14401 harness connector from speed control servo.
- With ignition switch in RUN, measure voltage between Pin 1 (Circuit 203 [O/LB]) and Pin 10 (GND, Circuit 57 [BK]).
- Is voltage approximately five volts?

Yes
GO to D3
No
GO to D2

D2 Check Circuit Continuity
- Measure resistance of Circuit 203 (O/LB) from Pin 1 of speed control servo connector to instrument cluster connector.
- Is resistance less than one ohm?

Yes
GO to D3
No
SERVICE open in Circuit 203 (O/LB).

D3 Display Turn On Test
- With ignition switch in RUN, connect Pin 1 (Circuit 203 [O/LB]) to Pin 10 (GND, Circuit 57 [BK]).
- Does Speed Control display turn on?

Yes
REPLACE speed control servo and REPEAT test.
No
SERVICE Instrument Cluster.