Code
B1206
Other
B — Body
EIC Switch-1 Assembly Circuit Open
AI status
Completed
Completed
100%
Causes
- Disconnected or loose connector at the EIC Switch-1 assembly
- Broken or chafed wiring between the switch and the control module
- Corroded or water-damaged connector or terminals
- Blown related fuse or loss of supply/ground to the circuit
- Failed EIC Switch-1 assembly (internal open)
- Faulty body/control module input or pin (rare)
Symptoms
- Related switch or feature does not operate or is intermittent
- Malfunction indicator or body system warning may be illuminated
- Stored diagnostic trouble code and possible accompanying communication faults
- System defaults or disabled function controlled by that switch
What to check
- Pull and visually inspect the EIC Switch-1 connector for corrosion, damage, bent pins or water intrusion
- Check the related fuse(s) and power/ground circuits for the switch
- Wiggle test wiring harness while monitoring the circuit for intermittent changes
- Scan for additional DTCs and note freeze-frame or related system codes
- Backprobe switch connector and measure voltages with key ON and switch actuated
Signal parameters
- Expected reference/supply: typically 5V or vehicle battery voltage depending on design (check wiring diagram)
- Switch closed: logic low or high per manufacturer (commonly ~0V for grounded switch or ~5V for supply-fed), switch open: no continuity/infinite ohms
- Resistance across switch when closed: usually low (near 0–100 ohms) — when open should read OL/infinite
- Continuity from switch harness pin to control module pin: near 0 ohms
- Ground continuity:
Diagnostic algorithm
- Read and record all DTCs, freeze frame data and any related body/module codes.
- Visually inspect the EIC Switch-1 connector and harness for damage, corrosion, contamination, or moisture. Repair as needed.
- Verify applicable fuses and power supplies for the switch circuit are present and correct.
- With ignition ON, backprobe the connector and confirm reference voltage and ground at the switch connector. Note readings with switch actuated.
- Measure resistance across the switch terminals (with switch removed or harness disconnected). Confirm open/closed values per signal parameters.
- Perform continuity check from the switch connector pins to the control module connector pins. Repair any open or high-resistance sections.
- If wiring and switch check good, replace the EIC Switch-1 assembly and retest.
- If the fault persists after replacing switch and repairing wiring, consult wiring diagrams and verify control module input. Consider module repair/reprogram only after wiring/switch verified.
- Clear codes and perform functional test / road test to verify repair.
Likely causes
- Loose or disconnected connector at the switch
- Open wire (broken conductor) in harness to the control module
- Corroded terminal or poor ground
- Failed switch assembly
Fault status
Status
Control module reports an open circuit in the EIC Switch-1 assembly wiring or the switch — no valid switch signal detected.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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