F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Driver/Vehicle Information Display: Pinpoint Tests
Test A: The Message Center Is Not Operating Correctly
PINPOINT TEST A: THE MESSAGE CENTER IS NOT OPERATING CORRECTLY
Normal Operation
The message center functionality is controlled through the message center switch, which is hardwired to the instrument cluster (IC) through input
circuit CMC29 (GN/VT) and return circuit RMC27 (WH/BN). There are 3 message center switch buttons with each button operating a switch that
uses different resistance values. The instrument cluster (IC) sends out a reference voltage to the message center switch on the input circuit and
monitors the voltage drop when a message center switch button is pressed. The voltage drop will vary depending upon the resistance of each button,
providing a specific indication to the instrument cluster (IC) which switch is pressed.
DTC B1205 (EIC Switch-1 Circuit Failure) - is a continuous and on-demand DTC that sets in the instrument cluster (IC) when the instrument cluster
(IC) detects any of the message center switch buttons stuck closed for more than 120 seconds continuously or during the on-demand self-test.
DTC B1206 (EIC Switch-1 Assembly Circuit Open) - is a continuous and on-demand DTC that sets in the instrument cluster (IC) when the instrument
cluster (IC) detects an open on the message center switch input, circuit CMC29 (GN/VT).
DTC B1208 (EIC Switch-1 Assembly Circuit Short to Ground) - is a continuous and on-demand DTC that sets in the instrument cluster (IC) when the
instrument cluster (IC) detects a short to ground on the message center switch input, circuit CMC29 (GN/VT).
DTC B1209 (EIC Switch-2 Assembly Circuit Failure) (base cluster only) - is set in continuous memory if the odometer reset button is stuck for 120
seconds or on-demand if the odometer reset button is stuck during the self-test.
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Message center switch
-
Instrument cluster (IC)
