B1159

Factory Manual References

Factory service manual diagnostic procedure for 2011 acura mdx

A L L Diagnostic Trouble Codes ( DTC )

B1055




DTC Troubleshooting: B1055, B1056, B1057

DTC B1055:

Relay Control Module Lost Communication with MICU (MICU Message)

DTC B1056:

Relay Control Module Lost Communication with MICU (ALARM Message)

DTC B1057:

Relay Control Module Lost Communication with MICU (DOORSW Message)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC B1055, B1056, or B1057 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connection between the relay control module and the MICU.�

5. Check for DTCs with the HDS.

Are DTCs B1055, B1056, B1057, B1157, B1159, B1255, B1355, B1806, B1811, B1955, B2155, and B2161 all indicated?

YES -

Do the MICU input test MICU Input Test.�

NO -

Do the relay control module input test Relay Control Module Input Test.�

B1056




DTC Troubleshooting: B1055, B1056, B1057

DTC B1055:

Relay Control Module Lost Communication with MICU (MICU Message)

DTC B1056:

Relay Control Module Lost Communication with MICU (ALARM Message)

DTC B1057:

Relay Control Module Lost Communication with MICU (DOORSW Message)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC B1055, B1056, or B1057 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connection between the relay control module and the MICU.�

5. Check for DTCs with the HDS.

Are DTCs B1055, B1056, B1057, B1157, B1159, B1255, B1355, B1806, B1811, B1955, B2155, and B2161 all indicated?

YES -

Do the MICU input test MICU Input Test.�

NO -

Do the relay control module input test Relay Control Module Input Test.�

Supporting Diagrams & Locations

Reference material from the factory manual for this diagnostic procedure.

Diagram

A/C Leak Detection (B07-025)

Location

Ac Power Outlet

Location

Accessory Power Sockets

Location

Active Damper System

Location

ACURALINK

Fuse/Relay

Battery Is Dead, Or A/C Cools Poorly (11-031)

Fuse/Relay

Acc/CMBS Indicator Is On With DTC 30 (14-022)

Fuse/Relay

2011 MDX: TQI And New Model Service Information (10-023)

Fuse/Relay

Acc/CMBS Indicator Is On With DTC 30 (14-022)

Related Procedures

Procedure

A/C Refrigerant (Compressor) Oil Guide (BJA34004)

Procedure

A/C Refrigerant And Oil Type Guide (BJA1330)

Procedure

A/C Refrigerant Type Guide (BJA11220)

Procedure

A/C Refrigerant Types Guide (BJA09917 VERSION 2)

Procedure

Drive Belt Squeaks (10-035)

Procedure

Always Enter Campaign Number On Proof Of Correction Certificate (B13010B)

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