TL V6-3.5L (2007)
-
DTC 2, 3, 4 and 5 simultaneously: Check for an open in the BLU wire between multiplex integrated control unit D11 and relay control module
K7, BRN/BLK wire between multiplex integrated control unit J4 and door multiplex control unit A5, LT GRN wire between multiplex
integrated control unit X27 and combination switch control unit No. 4 and automatic lighting control unit No. 4, BRN/YEL wire between
multiplex integrated control unit N28 and gauge control module B11. If the wire is OK, substitute a known-good under-dash fuse/relay box
(multiplex integrated control unit), under-hood fuse/relay box, power window master switch, wiper/washer switch and gauge one at a time, in
that order, and recheck for the DTCs after each substitution.
-
DTC 1 only: Go to MICU input test.
-
DTC 2 only (no other DTCs present): Go to the relay control module input test. If all inputs are OK, substitute a known-good relay control
module and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
-
DTC 3 only (no other DTCs present): Go to the door multiplex control unit input test. If all inputs are OK, substitute a known-good door
multiplex control unit and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
-
DTC 4 only (no other DTCs present): Go to the combination switch control unit input test. If all inputs are OK, substitute a known-good
wiper/washer switch and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
-
DTC 5 only (no other DTCs present): Go to the gauge control module input test. See: Component Tests and General Diagnostics/Gauge
Control Module Input Test If all inputs are OK, substitute a known-good gauge control module and then a MICU, one at a time, and then
check for DTCs. If a DTC recurs after a substitution, replace that unit.
8. Check for B-CAN DTCs indicated by the gauge control module while still in Test Mode 1.
Are any DTCs indicated?
YES - Go to step 9.
NO - Go to step 11.
9. Record all DTCs and sort them by type.
10. Troubleshoot the DTCs in these order:
-
Battery voltage DTCs
-
Internal error DTCs
-
Loss of communication DTCs (begin with the lowest number first; for example, if B1006 and B1059 are retrieved, troubleshoot B1006 first)
-
Signal error DTCs
Test Mode 2
11. Remove the MPCS service connector from the under-dash fuse/relay box socket for 5 - 10 seconds, then re-insert it to enter Test Mode 2. When
the system enters Test Mode 2, the front and rear map lights will flash two times quickly.
NOTE: If the MPCS service connector is disconnected for too short or too long of a time, or the ignition switch is turned OFF, the system will
return to Test Mode 1.
