DTC Hummer B1478 Short Explanation
Channel: Maxidot Hummer
Date: 2020-06-20

The video focuses on the basic Hummer specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make: 
HUMMER 
Code: 
B1478 
Definition: 
Retained Accessory Power Circuit High 
Description: 
Battery voltage is 9-16 volts. 
Cause: 
The BCM detects a short to voltage in the RAP relay coil control circuit when the BCM is trying to energize the RAP relay.
The condition above must be present for more than 1 second.