Bus +/- Signals Open From Overhead Travel Information System Module
NOTE:
After making any repairs, perform BODY CONTROL MODULES SYSTEM VERIFICATION TEST
under VERIFICATION TESTS.
- Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select BODY, then BODY COMPUTER. If scan tool communicates with Body Control Module (BCM), go to next step. If scan tool does not communicate with BCM, perform BUS +/- SIGNALS OPEN FROM BODY CONTROL MODULE test.
- Turn ignition off. Disconnect Overhead Travel Information System (OTIS) module connector. Turn ignition on. Using a 12-volt test light connected to ground, probe OTIS module connector terminal No. 2, fused ignition switch output circuit (Dark Blue/White wire). See Fig 1 . If test light illuminates, leave OTIS module connector disconnected, and go to next step. If test light does not illuminate, repair Dark Blue/White wire as necessary.
- Turn ignition off. Measure resistance between ground and OTIS module connector terminal No. 3, ground circuit (Black/Light Green wire). If resistance is less than 5 ohms, leave OTIS module connector disconnected, and go to next step. If resistance is 5 ohms or more, repair open in Black/Light Green wire.
- Turn ignition off. 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. Go to next step.
- Using scan tool, select DRB STANDALONE, LAB SCOPE, LIVE DATA, 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. Go to next step.
- Connect Black lead to chassis ground. Connect Red lead to OTIS module connector terminal No. 5, 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 OTIS module. If voltage does not pulse from zero to about 7.5 volts, leave OTIS module connector disconnected, and go to next step.
- Turn ignition off. Remove BCM from back of junction block. Measure resistance of PCI bus circuit (Violet/Yellow wire) between OTIS module connector terminal No. 5 and terminal No. 10 at BCM connector on back of junction block. See Figure and Fig 1 . If resistance is less than 5 ohms, replace BCM. If resistance is 5 ohms or more, repair open in Violet/Yellow wire.
NOTE:
Steps 4
- 6
are written specifically for use with Chrysler's Diagnostic Readout Box (DRBIII(R)) scan tool.