Mariner 2WD V6-3.0L (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 is located in the center of the instrument cluster between the tachometer and the speedometer in the vacuum fluorescent display
area. The message center is integral to the instrument cluster and uses the same voltage supply as the instrument cluster. The RUN/START voltage is
supplied to the instrument cluster on circuit CBP29 (WH/VT) and the keep alive B+ voltage is received on circuit SBP26 (YE/RD). The instrument
cluster logic ground is through circuit GD112 (BK/GN) and the bulb ground is through circuit GD114 (BK/BU). The message center functionality is
controlled through the message center switch, which is hardwired to the instrument cluster through input circuit CMC29 (GN/VT) and return circuit
VMC29 (YE).
This pinpoint test is intended to diagnose the following:
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Instrument cluster
A1-A3
Test B: The Message Center Switch Does Not Operate Correctly
PINPOINT TEST B: THE MESSAGE CENTER SWITCH DOES NOT OPERATE CORRECTLY
Normal Operation
The message center functionality is controlled through the message center switch, which is hardwired to the instrument cluster through input circuit
CMC29 (GN/VT) and return circuit VMC29 (YE). There are 3 message center switch buttons with each button operating a switch that uses different
resistance values. The instrument cluster 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 which switch is pressed.
DTC B1206 (EIC Switch-1 Assembly Circuit Open) - is a continuous and on-demand DTC that sets when the instrument cluster 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 when the instrument cluster detects a
short to ground on the message center switch input, circuit CMC29 (GN/VT).
This pinpoint test is intended to diagnose the following:
