Code
B1216
ALFA ROMEO
B — Body
Emergency assistance / roadside switch
Views:
UK: 8
EN: 12
RU: 15
AI status
Completed
Completed
100%
Causes
- Faulty emergency assistance / roadside switch (mechanical or electrical failure)
- Damaged, corroded, or disconnected wiring or connector between switch and control module
- Short to ground or short to battery in the switch circuit
- Blown fuse or improper power/ground to the related circuit
- Faulty body or telematics control module that reads the switch
- Water ingress or contamination at switch or connector
Symptoms
- Emergency/roadside assistance button does not respond when pressed
- No telematics/assistance call initiated when the switch is used
- Related dash message or indicator lamp illuminated
- Stored B1216 trouble code (may be accompanied by other body/telematics codes)
- Intermittent function of the assistance system (works sometimes)
What to check
- Use a diagnostic scanner to read/record fault codes and freeze-frame data; note any related codes
- Verify battery voltage and health before tests (low voltage can cause false faults)
- Visually inspect the switch for damage, contamination, or water ingress
- Inspect the switch connector for corrosion, bent pins, or poor mating
- Check relevant fuses and power supplies for the assistance circuit
- Operate the switch while observing live data or using a DVOM to watch circuit voltage/state
Signal parameters
- Typical supply: switched ignition battery voltage (~12 V) present with ignition ON (verify vehicle-specific)
- Switch output: digital/contact signal — expected idle vs actuated state (common: open/high when released, near 0 V when pressed)
- Resistance when closed: near 0 Ω between switch terminals when pressed
- Continuity: low resistance path between switch and control module connector pins
- CAN/TELEMATICS: module should transmit/receive assistance availability messages when switch changes state (verify with dealer-level tool)
Diagnostic algorithm
- Connect a capable diagnostic tool and record all related fault codes and freeze-frame data; note time and ignition state
- Clear code and attempt to re-create the fault by operating the assistance switch several times while monitoring live data
- Confirm proper battery voltage (12–14 V) and check relevant fuses
- Visually inspect switch and connector for damage, corrosion, moisture, or foreign matter; repair or clean as needed
- Backprobe the switch connector with ignition ON and press/release the switch while observing voltage or continuity; compare to expected signal parameters
- If signal is absent or incorrect, follow the wiring harness to midpoint and check continuity to the telematics/body control module; repair any opens/shorts
- If intermittent, perform wiggle tests on harness, connectors, and around door/pillar areas while monitoring the signal
- If wiring and switch check good, inspect/replace the switch (low cost) and re-test
- If replacement switch still does not restore proper signal, consider inspecting or replacing the receiving control module or update module software per manufacturer service information
- After repairs, clear codes and perform full function test; road test if necessary to confirm the issue is resolved
Likely causes
- Switch contacts worn or stuck from dirt or moisture
- Connector pins corroded or loose at the switch harness
- Broken wire at a harness flex point (doors/pillars)
- Missing/ blown fuse supplying switched power to the circuit
Fault status
Status
B1216 — Emergency assistance / roadside switch circuit: signal out of expected range, open, short, or intermittent. The system has detected that the roadside assistance call switch is not providing the expected input to the control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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