DTC 49-1: SH-AWD Control Unit (PG Line Open)

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: Before you troubleshoot, review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Clear the DTC with the HDS
Start the engine
Check for DTCs with the HDS
Is DTC 49-1 indicated?

YES -Go to step 5

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
Disconnect SH-AWD control unit connector B (8P)
Check for continuity between SH-AWD control unit connector terminal B2 and body ground

Fig 1: Checking Continuity Between SH-AWD Control Unit Connector Terminal B2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Update the SH-AWD control unit if it does not have the latest software (see HOW TO TROUBLESHOOT CIRCUITS AT THE SH-AWD CONTROL UNIT ), or substitute a known-good SH-AWD control unit (see SH-AWD CONTROL UNIT REPLACEMENT ), and recheck If the symptom/indication goes away with the updated SH-AWD control unit, troubleshooting is complete If the symptom/indication goes away with a known-good SH-AWD control unit, replace the original SH-AWD control unit (see SH-AWD CONTROL UNIT REPLACEMENT )

NO -Repair open in the wire between SH-AWD control unit connector terminal B2 and body ground, or repair poor body ground at G652