LX470, SC300 & SC400 (With Memory)

Disconnect remote control mirror ECU harness connectors. Using an ohmmeter, check for continuity between specified remote control mirror ECU connector terminals (harness side) within specified conditions. See REMOTE CONTROL MIRROR ECU CIRCUIT CONTINUITY (LX470) or REMOTE CONTROL MIRROR ECU CIRCUIT CONTINUITY (SC300 & SC400) table. See Fig 1 or Fig 2 . If continuity does not exist, repair wiring harness as necessary. If continuity exists, check remote control mirror ECU. See REMOTE CONTROL MIRROR ECU PIN VOLTAGES under COMPONENT TESTS.

REMOTE CONTROL MIRROR ECU CIRCUIT CONTINUITY (LX470)

Condition		Continuity Between Terminals No.
All Conditions		7 & 19; 10 & 11; 10 & 12; 14 & Ground; 22 & 23; 23 & 24
Left Switch
Up		6 & 17
Down		6 & 16
Left		4 & 17
Right		4 & 16
Right Switch
Up		5 & 17
Down		5 & 16
Left		3 & 17
Right		3 & 16

REMOTE CONTROL MIRROR ECU CIRCUIT CONTINUITY (SC300 & SC400)

Condition

Continuity Between Terminals

All Conditions

A1 & A2; A1 & A3; A8 & A10; A9 & A10; A11 & Ground; A12 & A13; A16 & ⁽¹⁾

Left Switch

B3 & B6

Down

B1 & B6

Left

B3 & B5

Right

B1 & B5

Right Switch

B2 & B3

Down

B1 & B2

Left

B3 & B4

Right

B1 & B4

⁽¹⁾	Continuity should exist between terminal A16 of remote control mirror ECU and terminal No. 1 of tilt and telescoping ECU connector T9, and between terminal A16 of remote control mirror ECU and terminal No. 18 of tilt and telescoping ECU connector T10. See Fig 3.

Fig 1: Testing Remote Control Mirror ECU & Circuits (LX470)

Fig 2: Testing Remote Control Mirror ECU & Circuits (SC300 & SC400 With Memory)

Fig 3: Identifying Tilt & Telescoping ECU Connectors & Terminals (SC300 & SC400 With Memory)