B1027
DTC B1027: Trunk Key Cylinder Switch Signal Error1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF and then back ON.
3. Operate the trunk key cylinder switch for 2 seconds.
4. Check the DTCs using the HDS.
Is DTC B1027 indicated?
YES - Go to step 5.
NO - Intermittent failure. The trunk key cylinder system is OK at this time.
5. with the trunk key cylinder switch in the off (neutral) position, select the TEST MODE MENU from the HDS and enter the DATA LIST.
6. Check the ON/OFF information of the Trunk Key Cylinder Switch (UNLOCK) in the DATA LIST.
Is the in formation indicator OFF?
YES - Go to step 7.
NO - Go to step 9.
7. Make sure the ON/OFF information of the Trunk Key Cylinder Switch (UNLOCK) are changed when the trunk key cylinder switch is turned to UNLOCK position with the key.
Does the information show ON when the trunk key cylinder switch is turned to UNLOCK position, and show OFF when the trunk key cylinder switch is returned to the off (neutral) position?
YES - Faulty MICU; replace it.
NO - Go to step 8.
8. Check for an open in the wire between the MICU and trunk key cylinder switch.
Are the wire harnesses OK?
YES - Faulty trunk key cylinder switch; replace it.
NO - An open in the wire, repair and recheck.
9. Disconnect the 3P connector from the trunk key cylinder switch.
10. Check the ON/OFF information of the Trunk Key Cylinder Switch (UNLOCK) in the DATA LIST.
Is the information indicator OFF?
YES - Faulty trunk key cylinder switch; replace it.
NO - Go to step 11.
11. Check for a short in the wire between the MICU and trunk key cylinder switch.
Are the wire harnesses OK?
YES - Faulty MICU; replace it.
NO - A short in the wire, repair and recheck.