Bus +/- Signal Open From Instrument Cluster
NOTE:
After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition off. Remove and inspect fuse No. 10 from fuse block. See Figure. If fuse is okay, reinstall fuse and go to next step. If fuse is faulty, repair short to ground on Dark Blue/Black wire.
- Remove and inspect fuse No. 18 from Power Distribution Center (PDC). See Figure. If fuse is okay, reinstall fuse and go to next step. If fuse is faulty, repair short to ground on Pink wire.
- Turn lights off. Disconnect Black 26-pin instrument cluster harness connector C1. Using ohmmeter, check resistance between instrument cluster harness connector C1 terminal No. 1 (Black wire) and ground. See Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or poor connection on Black wire between connector C1 and ground, located at lower edge of instrument panel.
- Turn ignition on. Using a voltmeter, check voltage on instrument cluster harness connector C1 terminal No. 14 (Dark Blue/Black wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open on Dark Blue/Black wire.
- Turn ignition off. Using a voltmeter, check voltage on instrument cluster harness connector C1 terminal No. 4 (Pink wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open on Pink wire.
- Ensure ignition is off. Connect scan tool to Data Link Connector (DLC). DLC is located on bottom of instrument panel, to left of brake pedal. See Figure. Turn ignition on. Using scan tool, attempt to communicate with other modules. If scan tool does not communicate with other modules, proceed to NO RESPONSE FROM PCI (PCI BUS) test. If scan tool communicates with other modules, go to next step.
- Connect Scope Input Cable (CH7058) to channel one connector on scan tool. Connect Red and Black leads, and Cable-to-Probe Adapter (CH7062) to scope input cable. Using scan tool, select DRB STANDALONE, LAB SCOPE, LIVE, then 12-VOLT SQUARE WAVE. Press F2 for scope. Press F2 again and use down arrow to set voltage range to 20 volts. Press F2 again. Connect Black lead to ground. Connect Red lead to instrument cluster harness connector C1 terminal No. 26, PCI bus circuit (Violet/Yellow wire). Turn ignition on. Observe voltage display on scan tool lab scope. If voltage pulses from zero to about 7.5 volts, replace instrument cluster. See ANALOG INSTRUMENT PANELS - PT CRUISER article. If voltage remains at zero volts, repair open Violet/Yellow wire.
NOTE:
If fuse No. 18 fuse is open, Vacuum Fluorescent (VF) display will flash FUSE, unless fuse No. 1 in fuse block is also open.