DTC 2622

DTC 2622  : TCU Diag

NOTE: 

• Check the vehicle 12 volt battery condition first .
• This navigation DTC sets when NG is indicated in the TCU diagnosis (The TCU icon is red in the System Links).
• Before you troubleshoot, make sure to follow the General Troubleshooting Information .

1. Problem verification

   -1. Clear the hard error codes .

   -2. Turn the vehicle to the OFF (LOCK) mode then the ON mode.

   -3. Check for hard error codes .

   Is DTC 2622 indicated?

   YES 

   The failure is duplicated, go to step 2.

   NO 

   Intermittent failure, the system is OK at this time.

2. Shorted wire check (TEL AUDIO+, TEL AUDIO- lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Open the driver's door, and wait more than 1 minute.

   -3. Disconnect the following connectors.

   Telematics control unit connector A (32P)

   Audio-navigation unit connector F (36P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Telematics control unit connector A (32P): disconnected
   	Audio-navigation unit connector F (36P): disconnected
   Test point 1	Telematics control unit connector A (32P) No. 12
   Test point 2	Body ground

   Test point 1	Telematics control unit connector A (32P) No. 13
   Test point 2	Body ground

   Is there continuity?

   YES 

   There is a short to body ground in the wire (s). Replace the affected shielded harness.

   NO 

   The TEL AUDIO+ and TEL AUDIO- wires are not shorted to ground. Go to step 3.

3. Shorted wire check (TEL AUDIO+ line to another lines)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Telematics control unit connector A (32P): disconnected
   	Audio-navigation unit connector F (36P): disconnected
   Test point 1	Telematics control unit connector A (32P) No. 12
   Test point 2	Telematics control unit connector A (32P) No. 13

   Test point 1	Telematics control unit connector A (32P) No. 12
   Test point 2	Telematics control unit connector A (32P) No. 28

   Is there continuity?

   YES 

   There is a short in the wire (s). Replace the affected shielded harness.

   NO 

   The TEL AUDIO+ wire is not shorted. Go to step 4.

4. Open wire check (TEL AUDIO+, TEL AUDIO- lines)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Telematics control unit connector A (32P): disconnected
   	Audio-navigation unit connector F (36P): disconnected
   Test point 1	Telematics control unit connector A (32P) No. 12
   Test point 2	Audio-navigation unit connector F (36P) No. 35

   Test point 1	Telematics control unit connector A (32P) No. 13
   Test point 2	Audio-navigation unit connector F (36P) No. 17

   Is there continuity?

   YES 

   The TEL AUDIO+ and the TEL AUDIO- wires are OK. Go to step 5.

   NO 

   There is an open in the wire (s). Replace the affected shielded harness.

5. Open wire check (TEL USB lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Open the driver's door, and wait more than 1 minute.

   -3. Disconnect the following connectors.

   Audio-navigation unit connector M (10P)

   Telematics control unit connector B (5P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	OFF (LOCK) mode
   	Audio-navigation unit connector M (10P): disconnected
   	Telematics control unit connector B (5P): disconnected

   Test point 1:  Audio-navigation unit connector M (10P)	Test point 2:  Telematics control unit connector B (5P)
   No. 6	No. 1
   No. 7	No. 2
   No. 8	No. 3
   No. 9	No. 4

   Is there continuity?

   YES 

   The TEL USB wires are OK. Go to step 6.

   NO 

   There is an open in the wire (s). Replace the affected shielded harness.

6. Telematics control unit check

   -1. Substitute a known-good Telematics control unit .

   -2. Reconnect all the connectors.

   -3. Turn the vehicle to the ON mode.

   -4. Clear the hard error codes .

   -5. Turn the vehicle to the OFF (LOCK) mode then the ON mode.

   -6. Check for hard error codes .

   Is DTC 2622 indicated?

   YES 

   Replace the audio-navigation unit .

   NO 

   Replace the original telematics control unit.