Test Aa: Message Center Switch Not Operating Properly
- Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to RUN position. Using NGS tester, retrieve, record and clear DTCs from all modules. Using NGS tester, perform instrument cluster self-test. If DTC B1205 or B1208 are not retrieved, go to next step. If DTC B1205 or B1208 is retrieved, go to step 3
.
- Turn ignition switch to LOCK position. Disconnect instrument cluster harness connector C254. Disconnect message center switch module harness connector C264. Measure resistance in Light Blue/White wire between terminal No. 22 at instrument cluster harness connector C254 and terminal No. 3 at message center switch module harness connector C264. See Figure
and Fig 1
. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 22 (Light Blue/White wire) at instrument cluster harness connector C254. Resistance should be greater than 10 k/ohms. If both resistances are as specified, go to next step. If either resistance is not as specified, repair open and/or short in Light Blue/White wire.
- Turn ignition switch to LOCK position. Disconnect message center switch module harness connector C264. Measure resistance between terminals No. 1 and 3 at message center switch module (component side). See Fig 2
. With no buttons depressed, 3.3 k/ohms should exist. With SELECT button depressed, 1.25 k/ohms should exist. With RESET button depressed, .76 k/ohms should exist. With both SELECT and RESET buttons depressed, .55 k/ohms should exist. If all resistances are as specified, go to next step. If any resistance is not as specified, replace message center switch module.
- Measure resistance between ground and terminal No. 6 (Black wire) at message center switch module harness connector C264. Measure resistance between ground and terminal No. 1 (Pink/Orange wire) at message center switch module harness connector C264. See Fig 1
. If both resistances are 5 ohms or less, replace instrument cluster. If either resistance is greater than 5 ohms, repair open in appropriate wire.
Courtesy of FORD MOTOR CO.
Courtesy of FORD MOTOR CO.