Engine-Codes
 
OBDII Code List
 
B1103 CHEVROLET

B1103 CHEVROLET - Communication Voltage Too Low

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

B1103 CHEVROLET Possible Causes

  • Faulty Sensing and Diagnostic Module (SDM)
  • Sensing and Diagnostic Module (SDM) harness is open or shorted
  • Sensing and Diagnostic Module (SDM) circuit poor electrical connection

Cost of diagnosing the B1103 CHEVROLET code

    Labor: 1.0

    The cost of diagnosing the B1103 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

B1103 CHEVROLET Possible Symptoms

  • Air Bag Warning Light ON

B1103 CHEVROLET Meaning

When the ignition switch is turned to ON, the Sensing and Diagnostic Module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself.

Upon passing these test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.

The SDM checks the wiring connection to each inflator by letting the infinitesimal current flow through the internal circuit and verify the resistance. But if the voltage is out of range, SDM is unable to check the airbag system properly.

OBDII Code B1103 CHEVROLET - Communication Voltage Too Low - Engine-Codes.com

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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