System Operation Check
WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
- Trouble shooting of a multiplex communication system complaint begins with verification of the customer problem. If problem occurs, go to step 3. If problem does not occur, go to next step.
- If problem does not occur, review conditions under which problem occurred for customer and try to duplicate those conditions. For example, if the problem occurs on rainy days or during high humidity conditions, sprinkle water onto vehicle and see if malfunction occurs. DO NOT sprinkle water directly into engine compartment or onto electronic components. Visually inspect for signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If problem still cannot be created, go to next step.
- Perform pre-check. See PRE-CHECK under SELF-DIAGNOSTIC SYSTEM. If there is a normal code, go to the next step. If there is a malfunction code, perform a circuit inspection. See DIAGNOSTIC TROUBLE CODE INDEX table.
- Determine the problem system.
- Body System. See BODY CONTROL SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
- Tilt and Telescopic System. See appropriate POWER TILT STEERING COLUMN SYSTEMS article.
- Power Seat System. See POWER, HEATED & MEMORY SEATS article under SEATS in ACCESSORIES & EQUIPMENT.
- Power Mirror Control System. See POWER, ELECTRO CHROMIC & MEMORY MIRRORS article under MIRRORS in ACCESSORIES & EQUIPMENT.
- After problem has been identified and repaired, confirm repairs. See CONFIRMATION TEST under SELF-DIAGNOSTIC SYSTEM.