What this code means
B1080 may indicate that the relay control module is seeing an ignition-state signal that does not agree with the ignition-state message from the body control module.
What the vehicle may do
- The vehicle may show body electrical warning behavior.
- Some ignition-related body electrical functions may act intermittently or inconsistently.
- The code can be present with other body network concerns.
Possible fault areas
- Possible IG1 input circuit concern.
- Possible power supply, connector, or terminal condition.
- Possible B-CAN-related context when other codes are present.
- Possible body control module involvement.
Diagnostic path
Opening context
On this Honda CR-V, B1080 is a plausibility-style body electrical code. In plain terms, the relay control module may be seeing the hard-wired IG1 ignition signal one way, while the body control module’s B-CAN ignition status message says something different. Depending on the failure, the vehicle may show body electrical warning behavior or intermittent ignition-related body functions. The broad fault areas can include the IG1 input circuit, a power supply issue, connector or terminal condition, B-CAN-related context when other codes are present, or possible body control module involvement. The key is not to guess at a module first; prove whether the IG1_METER circuit looks normal under the commanded condition.
Start with the basic checks
Before diving into the B1080-specific test, start with the basic troubleshooting checks and follow a structured diagnostic approach. That keeps you from chasing this ignition-signal mismatch before you know the rest of the system context is clean.
Understand what sets B1080
The logic for B1080 is based on a mismatch. If the relay control module detects a difference between the IG1 signal input and the IG1 signal message coming from the body control module over B-CAN for a set time or more, it stores the code. So treat this as a signal agreement problem, not just a simple open-or-short check.
Handle other codes first
If other codes are present, don’t work this one in isolation. Check what those codes mean first and follow the B-CAN diagnostic path as needed, because a communication or network-side problem can change how you interpret this IG1 mismatch.
Reproduce the monitor condition
To start the B1080 check, turn the vehicle to ON mode. Then wait for at least 6 seconds. That gives the module time to evaluate the ignition signal agreement before you move into scan data and circuit inspection.
Use scan data for the IG1 check
Next, use the HDS in Body Electrical, then Semiconductor Fuse, then Data List. From there, perform the IG1_METER circuit inspection. The check is done at the connected body control module connector A, the 66P connector, using the female terminals, with IG Mode and the IG1_METER circuit inspection ON.
Interpret the IG1_METER result
For the IG1_METER circuit inspection, the normal condition is 12 V battery voltage. If that inspection is abnormal, the problem is in the circuit. If the power supply inspection in the table is abnormal, continue with the additional power supply inspection to locate the failure. If the circuit inspection is normal, the diagnostic path points to a problem with the body control module.
Verification and takeaway
Keep verification separate from the testing step. Recheck the same ON-mode condition, wait for at least 6 seconds, confirm the IG1_METER result is 12 V battery voltage, and confirm B1080 does not come back. The takeaway: B1080 is about disagreement between the IG1 input and the body control module’s ignition status message, so prove the circuit first, then follow the result instead of guessing. For more diagnostic training, visit stepdiagnostics.com.
Final check
B1080 is often approached as an ignition signal plausibility problem, where the circuit result determines whether to stay on wiring and power supply checks or move toward body control module diagnosis
For more guided automotive diagnostics, visit STEP Diagnostics.
