What Does B1207 Mean?
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the Electronic Instrument Cluster (EIC) Switch-1 Assembly circuit. This means a control circuit that should normally operate at a lower voltage or ground reference is seeing constant battery voltage (12V+), likely due to damaged wiring or a faulty switch assembly. The BCM monitors switch inputs and sets this code when unexpected voltage is present on the circuit.
Common Causes
40%
Damaged wiring harness with wire insulation chafed or broken, causing short to power wire
30%
Faulty EIC switch assembly with internal short circuit to power supply
20%
Corroded or damaged connector terminals at BCM or switch assembly creating cross-circuit short
10%
Failed Body Control Module with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring between BCM and instrument cluster switch assembly, looking for pinched, chafed, or damaged wires especially near metal edges, mounting brackets, and door hinges
2
Step 2: Disconnect the EIC Switch-1 assembly connector and measure voltage at the BCM side of the circuit using a digital multimeter - should read 0V with switch disconnected; if 12V is present, wiring is shorted to power
3
Step 3: Inspect all connector terminals at both switch assembly and BCM for corrosion, bent pins, or evidence of moisture intrusion; clean or repair as needed
4
Step 4: With switch disconnected, use multimeter in continuity mode to check for short to power by testing circuit wire against known power sources; resistance should be infinite (OL)
5
Step 5: If wiring tests good, reconnect switch and monitor live data for switch state while manipulating switch; erratic readings indicate faulty switch assembly requiring replacement
6
Step 6: Clear codes, operate all switch functions, and verify code does not return; if code returns immediately, suspect BCM internal fault
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the Electronic Instrument Cluster (EIC) Switch-1 Assembly circuit. This means a control circuit that should normally operate at a lower voltage or ground reference is seeing constant battery voltage (12V+), ...
The most common cause of B1207 (EIC Switch-1 Assembly Circuit Short To Battery) is: Damaged wiring harness with wire insulation chafed or broken, causing short to power wire
Typical repair costs for B1207 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive, but affected switch functions (such as turn signals, wipers, or cruise control depending on switch location) may not operate correctly or may operate intermittently. Repair should be completed soon to maintain full vehicle functionality and prevent potential safety issues from non-functional controls.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1207 to identify the root cause.
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Quick Info
Category
Body
System
Body Control / Instrument Cluster
Difficulty
Type
Manufacturer
Recommended Tools
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