RL V6-3.5L (2007)
between MICU N28 and combination switch control unit No. 4 LT GRN wire between MICU J4 and driver's MPCS unit A28 and LT GRN
wire between MICU N22 and gauge control module B17. If the wire is OK, substitute a known-good driver's under-dash fuse/relay box,
under-hood fuse/relay box, gauge control module, wiper/washer switch and driver's MPCS unit one at a time, in that order, and recheck for the
DTCs after each substitution.
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DTC 1 only: Go to MICU input test.
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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 driver's MPCS unit input test. If all inputs are OK, substitute a known-good driver's MPCS
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. 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.
Are any DTCs indicated?
YES - Go to step 9.
NO - Go to step 11.
9. Record all DTCs and sort them by type using the DTC Troubleshooting.
10. Troubleshoot the DTCs in these order:
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Battery voltage DTCs
-
Internal error DTCs
-
Loss of communication DTCs (begin with the lowest number first; for example, if B1005 and B1008 are retrieved, troubleshoot B1005 first)
-
Signal error DTCs
Test Mode 2
11. Remove the MPCS service connector from the driver's under-dash fuse/relay box socket for 5-10 seconds, then re-insert it to enter Mode 2. When
the system enters Mode 2, the front and rear map lights will flash two times quickly.
NOTE: If the MPCS 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.
12. The given tables list the circuits that can be checked in Test Mode 2. Operate the switch that is most closely related to the problem. If the circuit is
OK, the map lights will blink once. If the circuit is faulty, there will be no indication.
