No message can mean an open circuit between the control modules.
As I mentioned in previous post, 1698 is not found in DTC list.
Behind the TCM there is a ground circuit. Try cleaning it and retest.
Headlight switch is linked to Central Timer Module and poor ground circuit can cause this.
At front headlights, check the wirings for damage. There are known cases of wirings fusing together causing similar problems.
Thursday, September 6th, 2012 AT 11:11 AM