USA models

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Check the vehicle battery condition first (see BATTERY TEST )
This navigation DTC sets when a problem (open or short) is detected in the COMM BUS.
Before you troubleshoot, make sure to follow the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )
Check for and resolve any B-CAN DTCs before troubleshooting
Check any official Honda service website for any service information about the AcuraLink or software updates.

Check the most recent DTC (see HOW TO CHECK ERROR HISTORY )
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then back to ON (II), or the ON mode
Check the most recent DTC (see HOW TO CHECK ERROR HISTORY )
Is DTC 1801 indicated at the time you cycled the vehicle?

YES -Go to step 4

NO -Intermittent failure, the system is OK at this time
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Check for poor connections or loose terminals at AcuraLink control unit (XM receiver) connector A (32P), and audio-navigation unit connector H (28P)
Are the connections OK?

YES -Go to step 6

NO -Repair poor connections or loose terminals in the applicable connector
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Check for XM (HIP) communication with the HDS
Does the XM (HIP) communicate with the HDS?

YES -Go to step 8

NO -Go to the
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Disconnect the AcuraLink control unit (XM receiver) connector A (32P) and audio-navigation unit connector H (28P)

Check for continuity between the terminals of AcuraLink control unit (XM receiver) connector A (32P) according to the table

CONTINUITY REFERENCE CHART

From terminal	To terminals
A (GRY)	A (WHT), A 18 (RED), A 19 (GRN), A 20 (BLK)

Fig 1: Identifying Acuralink Control Unit (XM Receiver) Connector A (32P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity between any of terminals?

YES -There is a short in the wires between the AcuraLink control unit (XM receiver) and the audio-navigation unit Replace the affected shielded harness

NO -Go to step 11

Check for continuity between the AcuraLink control unit (XM receiver) connector A (32P) terminals No 17, No 18, No 19, and No 20 to body ground individually

Fig 2: Checking Continuity Between Acuralink Control Unit (XM Receiver) Connector A (32P) Terminals Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -There is a short to body ground in the wire(s) between the AcuraLink control unit (XM receiver) and the audio-navigation unit Replace the affected shielded harness

NO -Go to step 12
Connect AcuraLink control unit(XM receiver) connector A (32P) terminals No 17, No 18, No 19, and No 20 to body ground with jumper wires

Fig 3: Connecting Acuralink Control Unit(XM Receiver) Connector A (32P) Terminals Body Ground With Jumper Wires
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between audio-navigation unit connector H (28P) terminals No 9, No 10, No 22, and No 23 to body ground individually

Fig 4: Checking Continuity Between Audio-Navigation Unit Connector H (28P) Terminals Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION )

NO -There is an open in the wire(s) between the AcuraLink control unit (XM receiver) and the audio-navigation unit Replace the affected shielded harness