DTC U0180: Gauge Control Module Lost Communication With AUTOLT Unit

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0) and then back to ON (II).
Wait for at least 6 seconds.
Check for DTCs with the HDS.
Is DTCs U0180 indicated?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections between the gauge control module and the automatic lighting control unit.
From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS.
Is the auto light unit detected?

YES -Go to step 9.

NO -Go to step 6.
Measure the voltage between body ground and automatic lighting control unit 14P connector terminals No. 7.

Fig 1: Measuring Voltage Between Body Ground And Automatic Lighting Control Unit 14P Connector Terminals No. 7
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 8.

NO -Go to step 7.
Check the No. 8 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES -Repair an open or high resistance in the No. 8 (7.5 A) fuse circuit.

NO -Replace the fuse. If the fuse blows again, repair a short to ground in the No. 8 (7.5 A) fuse circuit.
Measure the voltage between body ground and automatic lighting control unit 14P connector terminals No. 11 and No. 12 individually.

Fig 2: Measuring Voltage Between Body Ground And Automatic Lighting Control Unit 14P Connector Terminals No. 11 And 12 Individually
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Go to step 9.

NO -Repair an open or high resistance in the ground wire or poor ground (G403).
Turn the ignition switch to LOCK (0).
Disconnect the gauge control module 32P connector.
Disconnect the automatic lighting control unit connector 14P.
Check for continuity between gauge control module 32P connector terminals No. 19 and No. 20 and automatic lighting control unit connector 14P terminals No. 3 and No. 4 respectively.

Fig 3: Checking Continuity Between Gauge Control Module 32P Connector Terminals And Automatic Lighting Control Unit Connector 14P Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Do the power and ground input test for the automatic lighting control unit (see AUTOMATIC LIGHTING SENSOR TEST/REPLACEMENT ). If the test results are OK, substitute a known-good automatic lighting control unit, and recheck. If the indication goes away, replace the original automatic lighting control unit. If the DTC is still present, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).

NO -Repair an open or poor connection in the B-CAN wire between the gauge control module and the automatic lighting control unit.