Connector Circuit Reference
Engine Oil Pressure Switch C103
Brake Fluid Level Switch C124
Instrument Cluster C220
operate correctly module (RCM)
Instrument cluster
If the safety belt and air bag warning indicators do not operate correctly,
GO to Pinpoint Test H (safety belt warning indicator) or GO to Pinpoint
Test R (air bag warning indicator).
If the safety belt and air bag warning indicators operate correctly,
INSTALL a new instrument cluster. REFER to Instrument Cluster (IC) in
this section. TEST the system for normal operation.
The message center warning chime is
inoperative
Instrument cluster
CONNECT the diagnostic tool. SELECT the instrument cluster warning lamps
and chime active command and trigger the chimes on.
If the chimes sound, the system is operating correctly at this time.
If the chimes do not sound, INSTALL a new instrument cluster. REFER
to Instrument Cluster (IC) in this section. TEST the system for normal
operation.
The message center switch tone is
inoperative
Instrument cluster
CHECK the operation of the message center switches.
If the message center switches do not operate correctly, GO to Pinpoint
Test AB.
If the message center switches operate correctly, INSTALL a new
instrument cluster. REFER to Instrument Cluster (IC) in this section.
TEST the system for normal operation.
Pin Number
(s)
Circuit
Designation/Description Normal Condition/Measurement
1 208 (GY) oil pressure signal
circuit
Less than 5 ohms between the oil pressure switch and the smart junction box (SJB). Greater than 10,000 ohms between the oil
pressure switch and ground.
Pin Number
(s) Circuit Designation/Description Normal Condition/Measurement
1 547 (LG/YE) brake fluid level signal
circuit
Less than 5 ohms between the brake fluid switch and the smart junction box (SJB). Greater than 10,000 ohms between the brake
fluid level switch and ground.
2 512 (TN/LG) brake fluid level return
circuit
Less than 5 ohms between the brake fluid level switch and the SJB.
Pin
Number(s) Circuit Designation/Description Normal Condition/Measurement
2 1205 (BK) ground 0 volts, less than 5 ohms between the instrument cluster and ground.
3 1001 (WH/YE) B+ voltage feed, hot at all
times
Greater than 10 volts at all times, less than 5 ohms between the instrument cluster and the smart junction box (SJB). Greater
than 10,000 ohms between the instrument cluster and ground.
6 1411 (GY/OG) message center switch input 0 volts, less than 5 ohms between the instrument cluster and the message center switch. Greater than 10,000 ohms
between the instrument cluster and ground.
7 1410 (TN/OG) message center switch return 0 volts, less than 5 ohms between the instrument cluster and the message center switch. Greater than 10,000 ohms
between the instrument cluster and ground.
13 1414 (LG/VT) key-in-ignition switch input 0 volts with the ignition key removed from the ignition lock cylinder, greater than 10 volts with the ignition key inserted into
the ignition lock cylinder. Less than 5 ohms between the instrument cluster and the ignition switch.
23 1083 (LB/PK) safety belt warning indicator
control circuit
0 volts, less than 5 ohms between the instrument cluster and the restraint control module (RCM). Greater than 10,000 ohms
between the instrument cluster and ground.
2005 Mustang Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/
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