Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1991SEVILLE V8-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWTRUNK OPEN
1991 Cadillac Seville V8-300 4.9L
Trunk Open
1991 Cadillac Seville V8-300 4.9LSECTION Trunk Open
Trunk Open Circuit:
TEST CONDITION:
Ignition 3 is on.
FAILURE CONDITION:
Trunk lid is open.
ACTION TAKEN:
Display the "Trunk Open" message on the CCDIC.
The BCM provides system voltage to the trunk open circuit, and the trunk open limit switch provides the only path to ground. The BCM internally monitors the voltage level at pin 3C15. When the trunk lid circuit is open the BCM will detect system voltage, but if the trunk open switch provides a path to ground (trunk lid open), the BCM will detect that the circuit has been grounded. The BCM will then send the "Trunk Open" message to the CCDIC.
DIAGNOSIS:
Condition Possible Causes:
^ Erroneous Message - short to ground on circuit 146 or shorted sensor.
^ No Message - open in circuit 146, open in sensor, or open in circuit 804.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.