Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA2015MDX BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEX (EXCEPT HYBRID)RELAY CONTROL SYSTEM DTCS
2015 Acura MDX Base
Relay Control System DTCS
2015 Acura MDX BaseSECTION Relay Control System DTCS
RELAY CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) INDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B1052 | Relay control module internal (EEPROM) error | Internal error |
| B1075 | Headlight switch malfunction | Signal error |
| B1076 | Windshield wiper signal error | Signal error |
| B1077 | Wiper switch (As) malfunction | Signal error |
| B1079 - Refer to: DTC Troubleshooting: B1079 (2017 2018 2019 2020), or DTC Troubleshooting: B1079 (2014 2015 2016) | Daytime running light malfunction | Signal error |
| B1080 | Power supply circuit (IG1 line) input error for relay control module and MICU | Signal error |
| B1081 | Left side LED headlight malfunction | Signal error |
| B1082 - Refer to: DTC Troubleshooting: B1082 (2017 2018 2019 2020), or DTC Troubleshooting: B1082 (2014 2015 2016) | Left side LED headlight circuit malfunction | Signal error |
| B1083 | Right side LED headlight malfunction | Signal error |
| B1084 - Refer to: DTC Troubleshooting: B1084 (2017 2018 2019 2020), or DTC Troubleshooting: B1084 (2014 2015 2016) | Right side LED headlight circuit malfunction | Signal error |
| U1280 | Relay control module communication bus line error (BUS-OFF) | Loss of communication |
| U1281 - Refer to: DTC Troubleshooting: U1281 (2017 2018 2019 2020), or DTC Troubleshooting: U1281 (Relay Control Module) (2014 2015 2016) | Relay control module lost communication with MICU (MICU frame) | Loss of communication |
| U128D - Refer to: DTC Troubleshooting: U128D (Relay Control Module (With Auto Idle Stop System)) (2016), or DTC Troubleshooting: U128D (2017 2018 2019 2020), or DTC Troubleshooting: U128D (Relay Control Module (Without Auto Idle Stop System)) (2014 2015 2016) | Relay control module lost communication with gauge control module (VSP/NE frame) | Loss of communication |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.