Section 458 (Overhead Junction Block): Inspection
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT OVERHEAD JUNCTION BLOCK ASSEMBLY
Disconnect the connector from the overhead J/B and inspect the connector on the wire harness side, as shown.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTOR TERMINALS SPECIFIED CONDITIONTester connection Condition Specified condition 1 - Ground Constant Continuity 5 - Ground Constant Continuity 13 - Ground Constant Battery positive voltage 17 - Ground Constant Battery positive voltage 26 - Ground Ignition switch OFF or ACC No voltage Ignition switch ON Battery positive voltage If continuity is not as specified, replace the overhead junction block.
- Overhead J/B side: INSPECT OVERHEAD JUNCTION BLOCK ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTOR TERMINALS SPECIFIED CONDITIONCircuit name Tester connection Specified condition Power source circuit A12-A26-A27-A28 Continuity Power source circuit A13-C6-D6 Continuity Multiplex communication circuit A14-A30-A31 Continuity Ground circuit A1-A15-A16-A32-C8-D2-E4-Body ground Continuity Microphone circuit B1-A19 Continuity Microphone circuit B4-A2 Continuity Microphone circuit B5-A3 Continuity Microphone circuit B6-A18 Continuity Mayday switch circuit D1-A23 Continuity Mayday switch circuit D3-A22 Continuity Mayday switch circuit D5-A21 Continuity Rader sensor circuit E1-A7 Continuity Rader sensor circuit E2-A8 Continuity Rader sensor circuit E3-A9 Continuity If continuity is not as specified, replace the overhead J/B assembly.