B1210

Step 1: Perform visual inspection of all connectors at the instrument cluster and BCM for loose connections, corrosion, pushed-out pins, or physical damage. Disconnect and reconnect connectors to ensure proper seating.

Step 2: Using a digital multimeter, check for continuity in the EIC Switch-2 circuit wiring from the BCM connector to the instrument cluster connector with ignition off and connectors disconnected. Readings should show less than 1 ohm resistance; infinite resistance indicates open circuit in harness.

Step 3: Inspect the wiring harness routing for pinch points, chafing, or damage particularly where harness passes through firewall, under dashboard, or near moving components. Repair or replace damaged sections as needed.

Step 4: With connectors connected and ignition on, use multimeter to verify proper voltage supply and ground at the EIC Switch-2 Assembly connector terminals per manufacturer specifications (typically 5V or 12V reference).

Step 5: If wiring and power supply are verified good, test the EIC Switch-2 Assembly by checking resistance across switch terminals in various switch positions. Replace switch assembly if readings are out of specification or show open circuit.

Step 6: Clear codes and perform functional test of all instrument cluster switches. Road test vehicle and verify code does not return and all switch functions operate normally.