Test 6, Cruise On-Off (Main) Switch

Remove CC ECU with connector connected. Turn ignition on. Backprobe CC ECU connector and measure voltage between ground and CC ECU connector terminal No. 19/CMS (Green/Black wire). Ensure battery voltage exists with CRUISE ON-OFF (MAIN) switch in OFF position. With CRUISE ON-OFF (MAIN) switch held in ON position, ensure existence of less than one volt. If voltage is as specified, go to test for next trouble code displayed or appropriate TROUBLE SHOOTING BY SYMPTOM . If voltage is not as specified, go to next step.
Turn ignition off. Disable SRS and wait 90 seconds. See AIR BAG RESTRAINT SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section. Remove steering wheel center pad (air bag module) and disconnect CRUISE ON-OFF (MAIN) switch 6-pin connector. Hold CRUISE ON-OFF (MAIN) switch in ON position. Ensure continuity exists between connector terminal No. 3 (White/Black wire) and terminal No. 5 (Green/Black wire). Ensure no continuity exists when CRUISE ON-OFF (MAIN) switch is in OFF position. If continuity is as specified, go to next step. If continuity is not as specified, replace switch and retest system.
Check harness and connectors between CC ECU, CRUISE ON-OFF (MAIN) switch and ground. Repair or replace as necessary. If harness and connectors are okay, replace CC ECU and retest system.