B2122

Code

Other B — Body

Driver Side Satellite Communication Circuit Short to Ground

Brand: Other

Type: B — Body

Views: UK: 24 EN: 39 RU: 26

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Page language: EN

Causes

Damaged or pinched wiring harness causing conductor contact with chassis ground
Corroded, bent, or contaminated connector pins at the driver-side satellite module or junction connector
Water intrusion or moisture in the connector or sensor body causing shorts
Internal short inside the driver-side satellite (impact) sensor/module
Poor or missing connector mating, improperly seated connector, or incorrectly routed harness after repair
Fault in the airbag/SRS control module or intermediate junction module

Symptoms

SRS/Airbag warning lamp illuminated on dash
Possible additional SRS or communication DTCs present
Driver-side side airbag or seatbelt pretensioner may be disabled (risk of non-deployment)
Intermittent or permanent loss of communication with the driver-side satellite module
Reduced vehicle diagnostic readiness for SRS system

What to check

Record all stored DTCs and freeze-frame data with a capable scan tool
Observe SRS warning lamp behavior and any additional related codes
Visually inspect wiring and connectors for the driver-side satellite module for damage, corrosion, or moisture
Inspect harness routing at common wear points (door hinge, seat frames, B-pillar, floor pans)
Check for aftermarket equipment or recent repairs in the area of the harness
Follow manufacturer safety procedures and isolate battery/disable SRS before disconnecting or handling SRS components

Signal parameters

Communication/diagnostic circuit expected: no direct short to chassis; continuity to ground should be very high (megohm range) when system intact
Short-to-ground condition typically shows low resistance to chassis (often
If on CAN bus: CAN High nominal ~2.5 V, CAN Low nominal ~1.5 V (idle differential ≈1.0 V); a shorted line can pull these voltages toward 0 V
If a LIN/serial communication line is used: idle voltage ~battery/2 or as specified by OEM — check wiring diagram for correct reference voltages

Diagnostic algorithm

Read and record all SRS and network DTCs and freeze-frame data with a capable scan tool
Review vehicle wiring diagrams and pinouts for the driver-side satellite module and associated connectors
Visually inspect connectors and harness routing from the airbag control module to the driver-side satellite module
With ignition OFF and following manufacturer safety procedure, disconnect battery negative and wait specified time before touching SRS components
Reconnect battery (or follow safe backprobe procedure per OEM) and backprobe the satellite module communication pin(s); measure voltage to chassis/ground with ignition ON to confirm low-voltage/short-to-ground condition
Check resistance between the suspect communication pin and chassis ground with the module disconnected. Low resistance indicates a short in the harness or module
If short present, isolate the wiring by disconnecting intermediate connectors and repeat resistance checks to locate the section with the short
Perform a wiggle test while backprobing to detect intermittent shorts; inspect areas where harness flexes or contacts metal
If short is localized to a connector, clean and repair pins, replace connector or repair pigtail as required
If wiring checks good up to the module connector, suspect internal module short — replace driver-side satellite module and recheck
After repair, clear DTCs, perform SRS system diagnostic cycle per OEM, and verify no further codes; if module replaced, follow programming/initialization procedures required by manufacturer

Likely causes

Wiring chafed at door hinge, seat, or body seam where harness flexes
Connector grommet compromised allowing water entry
Previous repair (collision or interior work) left wiring pinched or misrouted
Connector locking tangs broken — partial contact causing intermittent short
Faulty satellite sensor developed internal short after impact

Fault status

⚠️ Status

Driver-side satellite communication circuit has a short to ground. SRS system has detected communication fault; side airbag may be disabled and requires inspection and repair.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours