Test No. 8: All Functions Of Keyless Entry System Will Not Operate
- Lithium battery should be changed in the remote transmitter. Using screwdriver, remove cover from remote transmitter. Note direction of battery installation. Remove battery from remote transmitter. Install NEW battery in remote transmitter. Reinstall cover.
- Recheck keyless entry system operation. If keyless entry system still does not operate, go to next step. If keyless entry system operates, problem was defective battery in remote transmitter.
- Check multiplex control system to see if Diagnostic Trouble Code (DTC) B1242 (Toyota hand-held tester) or DTC No. 42 (open door indicator light) exists. See MULTIPLEX CONTROL SYSTEMS - PRIUS article. If DTC B1242 (Toyota hand-held tester) or DTC No. 42 (open door indicator light) does not exist, go to next step. If DTC B1242 (Toyota hand-held tester) or DTC No. 42 (open door indicator light) exists, perform service procedure for DTC and recheck keyless entry system operation.
- Ensure ignition is off. Disconnect electrical connector at wireless door control receiver. Wireless door control receiver is located near center of instrument panel and contains a 5-pin electrical connector. See Fig 1. Note location of Body Electronic Control Unit (ECU) at driver's side of instrument panel on the fuse/relay box. See Figure. Body ECU uses an 18-pin and 20-pin electrical connector. Disconnect electrical connector B8 at body ECU. See Figure.
- Using ohmmeter, check for continuity between terminal No. 3 (Black/Red wire) at electrical connector for wireless door control receiver and terminal No. 7 (Black/Red wire) at electrical connector B8 for body ECU. For terminal identification on wireless door control receiver electrical connector, see Fig 2. For terminal identification on electrical connector B8 for body ECU, see Figure. If continuity exists, reinstall electrical connectors and go to next step. If continuity does not exist, repair wiring as necessary. Reinstall electrical connectors and recheck keyless entry system operation.
- Replace wireless door control receiver with a known-good wireless door control receiver and recheck keyless entry system operation. If keyless entry system still does not operate, go to next step. If keyless entry system operates, original wireless door control receiver was defective.
- Check key unlock warning switch. See KEY UNLOCK WARNING SWITCH under COMPONENT TESTS. If key unlock warning switch is okay, go to next step. If key unlock warning switch is defective, replace key unlock warning switch and recheck keyless entry system operation. See KEY UNLOCK WARNING SWITCH under REMOVAL & INSTALLATION.
- Check wiring harness and electrical connectors between key unlock warning switch and body ECU. See WIRING DIAGRAMS in POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - PRIUS article. Key unlock warning switch may also be referred to as unlock warning switch. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector is defective, repair as necessary and recheck keyless entry system operation.
- Check body ECU for proper voltage and input signals. See BODY ELECTRONIC CONTROL UNIT under PIN VOLTAGE TESTS. If proper voltage and input signals exist, go to next step. If proper voltage and input signals do not exist, repair as necessary and recheck keyless entry system operation.
- Replace body ECU with a known-good body ECU and recheck keyless entry system operation. If keyless entry system operates properly, original body ECU was defective. If keyless entry system still does not operate properly, check wiring harness and electrical connectors between body ECU, key unlock warning switch and wireless door control receiver for intermittent problem. See WIRING DIAGRAMS in POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - PRIUS article. Repair wiring harness or electrical connector as necessary.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002